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Following that, I'll come back and summarize a few key points and open the call to questions. I'm pleased to report fourth-quarter results with better-than-expected revenues and earnings. As of the end of Q4, we achieved several major milestones, including 17 million Invisalign patients treated, including 4.7 million teens, plus 4 million Vivera Retainer cases and over 100,000 iTero scanners sold. And for the full year -- fiscal year 2023, total revenues exceeded our prior outlook, and we delivered fiscal 2023 non-GAAP operating margin above 21%.

For Q4, total revenues were up 6.1% year over year, reflecting increased Systems and Services revenues. Strength in Clear Aligner volumes for teens and international doctors as well as continued growth from Invisalign touch-up cases, under our Invisalign Doctor Subscription Program, or DSP. Our Q4 Systems and Services revenues were up year over year primarily due to increased services, CAD/CAM and nonsystems revenues, including scanner leasing and rental programs and certified preowned scanner sales. Q4 total Clear Aligner shipments were slightly lower year over year.

On a year-over-year basis, Clear Aligner volumes were down for the Americas and EMEA regions and were up for the APAC region. For Q4, Clear Aligner shipments include approximately 20,000 Invisalign DSP touch-up cases, primarily in North America, an increase of more than 60% year over year from Q4 '22. DSP continues to be well received by our customers and is currently available in the U.S. and Canada, Iberia, and Nordics and most recently, the U.K.

We're excited that DSP is proving helpful to doctors and their patients as we continue to expand the program. For fiscal 2023, total Invisalign DSP touch-up cases shipped were 73,000, up 85% year over year. For non-case revenues, Q4 was up 13.3% year over year primarily due to continued growth from Vivera Retainers along with Invisalign DSP retainer revenues. On a sequential basis, Q4 total revenues were down slightly, 0.4%, primarily reflecting anticipated seasonally lower teens case starts, especially in the U.S.

ortho channel and unfavorable foreign exchange offset somewhat by increased revenues from System and Services as well as an increase in Clear Aligner volume for adults and noncomprehensive cases and stronger volumes from Canada and the EMEA region. Q4 total Aligner shipments were slightly lower sequentially. On a sequential basis, Clear Aligner volumes were down for the Americas and APAC regions and were up sequentially for the EMEA region. The December gauge practice analysis tool that collects and consolidates data from approximately 1,000 orthodontic practices across the U.S.

and Canada reported year-over-year decline for new patients, total exams, and total starts, particularly among teens and kids. It also shows a year-over-year decline for wires and brackets and total Clear Aligner starts with Invisalign case starts better than the Clear Aligner brand. And the teen segment for Q4, a 197,000 teens and younger patients started treatment with Invisalign Clear Aligner Systems, up 6% year over year and were a record number of teen cases shipped compared to prior fourth quarters. Q4 teens starts were down sequentially, consistent with historical seasonality, primarily in China as well as seasonally fewer teen starts in North America compared to Q3.

For fiscal 2023, total Invisalign Clear Aligner shipments for teens and younger patients reached a total of 809,000 cases, up 8% compared to the prior year and made up 34% of total Clear Aligner shipments. During Q4, we announced that the U.S. Food and Drug Administration cleared the Invisalign Palatal Expander System, we call it IPE, Invisalign Palatal Expander for commercial availability in the United States. The FDA 510(k) clearance is for broad patient applicability, including growing children, teens, and adults.

Full early intervention treatments such as Phase I or early interceptive treatment, makes up about 20% of the orthodontic case starts each year and is growing. Together with Invisalign First Aligners, IPEs provide doctors with a solution set to treat the most common skeletal, dental malocclusions in growing children. The addition of mandibular advancement features to Invisalign aligners also provides doctors with more options for treating skeletal, dental joint balances and bite correction and for their growing patients during their teenage years. Essentially, we now have an Invisalign digital treatment solution for every phase of treatment.

IPE is currently available on a limited basis in Canada and the United States, and we recently received regulatory clearance in Australia and New Zealand where we anticipate commercialization in Q2. We expect IPE to be available in other markets pending future applicable regulatory approvals. We're also launching ClinCheck smile video, the next generation of in-face visualization with AI-assisted video that is expected to be available to all doctors who use the Invisalign Practice App and ClinCheck treatment planning software. This new tool is designed to help improve patients' understanding and the confidence in Invisalign treatment and is based on iTero Intraoral Scanner and doctors ClinCheck plan for Invisalign treatment.

ClinCheck smile video simulates the doctor's ClinCheck treatment plan with a short video of a patient's face, and they talk and smile, which helps patients visualize their potential new smile and can lead to a higher patient treatment acceptance. We expect to roll out ClinCheck smile video in Q1 '24 in North America and EMEA, followed by APAC later in the year. Before I turn the call over to John for our fourth quarter financial review, I want to share one more exciting news. Today, we introduced the latest innovation in the iTero family of intraoral scanners.

The iTero Lumina intraoral scanner is designed to meet the needs of doctors and their patients by offering smaller wand with unparalleled data capture capabilities for effortlessly scanning by clinical members. The iTero Lumina Intraoral scanner is a breakthrough technology. With 3x wider field of capture and a 50% smaller wand that delivers faster scanning, higher accuracy, and superior visualization for greater practice efficiency. iTero Lumina quickly, easily, and accurately captures more data while delivering exceptionally scanned quality and photorealistic images that eliminate the need for intraoral photos altogether.

Doctors can now scan at twice the speed with a wide field of capture, multi-angled scanning, and large capture distance, meaning they can capture more dentition in greater detail throughout the scanning process. To date, Align has filed over 30 patent applications covering technology related to the iTero Lumina intraoral scanner. I believe iTero Lumina has the potential to set a new standard of care for dental practices by simplifying the scanning of complex oral regions while offering superior chairside visualization and more comfortable experience for patients, especially kids. Initial doctor feedback has been very positive, noting that iTero Lumina scanner is much faster, clear, less invasive for their patients and the imaging and visualization translates to better communications and patient experience.

The iTero Lumina intraoral scanner is available now with orthodontic workflows and will be available in the second half of 2024 restorative workflows, although we expect that GP practices can benefit now from the new scanning technology. A global broadcast to unveil iTero Lumina and provide attendees with insights and detailed information from our iTero team and early customer users is planned for February 15. Registration will open on February 1 and the link has been provided in our financial slides as well as in today's press release. With that, I'll turn the call over to John.

John Morici -- Chief Financial Officer

Thanks, Joe. Now, for our Q4 financial results. Total revenues for the fourth quarter were $956.7 million, down 0.4% from the prior quarter and up 6.1% from the corresponding quarter a year ago. On a constant currency basis, Q4 '23 revenues were impacted by unfavorable foreign exchange of approximately $12.8 million or approximately 1.3% sequentially and were favorably impacted by approximately $13.8 million year over year or approximately 1.5%.

For Clear Aligners, Q4 revenues of $781.9 million were down 1.6% sequentially, primarily from lower volumes. On a year-over-year basis, Q4 Clear Aligner revenues were up 6.9% and primarily due to higher ASPs and non-case revenues slightly offset by lower volumes. For Q4, Invisalign ASPs for comprehensive treatment were up sequentially and up year over year. On a sequential basis, ASPs reflect higher additional aligners, partially offset by the unfavorable impact from foreign exchange, higher sales credits and higher discounts.

On a year-over-year basis, the increase in comprehensive ASPs reflect higher additional aligners, price increases and favorable impact from foreign exchange partially offset by higher discounts in product mix to lower ASP products. For Q4, ASPs for noncomprehensive treatment were down sequentially and up year over year. On a sequential basis, the decline in ASPs reflect the unfavorable impact from foreign exchange, a product mix shift to lower ASP products and higher net revenue deferrals, partially offset by price increases and lower discounts. On a year-over-year basis, the increase in ASPs reflect price increases, the impact from favorable foreign exchange and higher additional aligners, partially offset by a product mix shift to lower ASP products and higher discounts.

Last quarter, we announced about a 5% global price increase for some Invisalign products across most markets effective January 1, 2024. Invisalign Comprehensive Three and Three product is available in North America and certain markets in EMEA and APAC, most recently launching in China, Korea, Hong Kong, and Taiwan. We are pleased with the continued adoption of the Invisalign Comprehensive Three and Three product and anticipate it will continue to increase, providing doctors the flexibility they want and allowing us to recognize more revenue upfront with deferred revenue being recognized over a shorter period compared to our traditional Invisalign comprehensive product. Q4 '23 Clear Aligner revenues were impacted by unfavorable foreign exchange of approximately $10.7 million or approximately 1.4% sequentially.

On a year-over-year basis, Clear Aligner revenues were favorably impacted by foreign exchange of approximately $12 million or approximately 1.6%. Clear Aligner deferred revenues on the balance sheet increased $14.9 million or 1.2% sequentially and $74.6 million or up 6.1% year over year and will be recognized as the additional aligners are shipped. Q4 '23 Systems and Services revenues of $174.8 million were up 5.8% sequentially primarily due to higher ASPs and an increase in CAD/CAM and services revenue, partially offset by lower volumes and were up 2.9% year over year primarily due to higher services revenues from our larger base of scanners sold and increased nonsystem revenues related to our CPO and leasing rental programs mostly offset by lower ASPs and scanner volume. CAD/CAM and services revenues for Q4 represent approximately 50% of our Systems and Services business.

Q4 '23 Systems and Services revenues were unfavorably impacted by foreign exchange of approximately $2.1 million or approximately 1.2% sequential. On a year-over-year basis, Systems and Services revenue were favorably impacted by foreign exchange of approximately $1.9 million or approximately 1.1%. Systems and Services deferred revenues on the balance sheet were down $4.3 million or 1.6% sequentially and down $13.1 million or 4.8% year over year primarily due to the recognition of services revenue which is recognized ratably over the service period. As our scanner portfolio expands and we introduce new products, we increased the opportunities for customers to upgrade, make trade-ins and purchase certified preowned scanners in certain markets.

Developing new capital equipment opportunities to meet the digital transformation needs of our customers and DSO partners is a natural progression for our equipment business with a large and growing base of scanners sold. Moving on to gross margin. Fourth quarter overall gross margin was 70%, up 0.9 points sequentially and up 1.5 points year over year. Q4 non-GAAP gross margin was 70.5% up 0.9 points sequentially and up 1.2 points year over year.

Overall, gross margin was unfavorably impacted by foreign exchange by approximately 0.4 points sequentially and favorably impacted by approximately 0.4 points on a year-over-year basis. Clear Aligner gross margin for the fourth quarter was 71.1% up 0.4 points sequentially primarily due to lower manufacturing spend, partially offset by higher freight costs. Clear Aligner gross margin for the fourth quarter was up 0.3 points year over year primarily due to higher ASPs and favorable foreign exchange, partially offset by higher manufacturing spend and freight costs. Systems and Services gross margin for the fourth quarter was 64.8%, up 3.8 points sequentially due to higher ASPs, partially offset by higher service and freight costs.

Systems and Services gross margin for the fourth quarter was up six points year over year due to improved manufacturing efficiencies and favorable foreign exchange, partially offset by lower ASPs. Before I go into the details, I want to note that during Q4 '23, we incurred a total of $14 million of restructuring and other charges, primarily related to post-employment benefits. Q4 operating expenses were $498 million, roughly flat sequentially and down 1.4 points year over year. On a sequential basis, operating expenses were up slightly due -- primarily due to restructuring and other charges, offset by lower employee compensation.

Year-over-year operating expenses decreased by $7.1 million primarily due to controlled spend on advertising and marketing as part of our efforts to proactively manage costs, partially offset by employee-related costs and slightly higher restructuring charges. On a non-GAAP basis, excluding stock-based compensation, restructuring and other charges and amortization of acquired intangibles related to certain acquisitions, operating expenses were $446.7 million, down 2.5% sequentially and down 2.8% year over year. Our fourth-quarter operating income of $171.5 million resulted in an operating margin of 17.9%, up 0.6 points sequentially and up 5.4 points year over year. Operating margin was unfavorably impacted by approximately 0.6 points sequentially primarily due to foreign exchange.

The year-over-year increase in operating margin is primarily attributed to operating leverage and proactively managing our costs as well as favorable impact from foreign exchange by approximately 0.6 points. On a non-GAAP basis, which excludes stock-based compensation, restructuring and other charges, the amortization of intangibles related to certain acquisition, operating margin for the fourth quarter was 23.8%, up two points sequentially and up 5.5 points year over year. Interest and other income and expense net for the fourth quarter was an income of $1.3 million compared to a loss of $4.2 million in the third quarter and income of $2.7 million in Q4 2022, primarily driven by favorable foreign exchange. The GAAP effective tax rate for the fourth quarter was 28.3%, higher than the third quarter effective tax rate of 25.1% and lower than the fourth quarter effective tax rate of 63.8% in the prior year.

The fourth quarter GAAP effective tax rate was higher than the third quarter effective tax rate primarily due to one-time benefit related to tax guidance issued in Q3, partially offset by lower U.S. taxes on foreign earnings in Q4. As a reminder, in Q4 2022, we changed our methodology for the computation of our non-GAAP effective tax rate to a long-term projected tax rate and have given effect to the new methodology from January 1, 2022. Our non-GAAP effective tax rate for the fourth quarter was 20%, reflecting the change in our methodology.

Fourth-quarter net income per share was $1.64, up sequentially $0.06 and up $1.10 compared to the prior year. Our EPS was unfavorably impacted by $0.07 on a sequential basis and favorably impacted by $0.08 on a year-over-year basis due to foreign exchange. On a non-GAAP basis, net income per diluted share was $2.42 for the fourth quarter, up $0.28 sequentially and up $0.69 year over year. Moving on to the balance sheet.

As of December 31, 2023, cash, cash equivalents, and short- and long-term marketable securities were $980.8 million, down sequentially $321.2 million and down $60.8 million year over year. Of our $980.8 million balance, $196.1 million was held in the U.S. and $784.7 million was held by our international entities. In October 2023, we purchased approximately 1 million shares of our common stock at an average price of $190.56 per share through a $250 million Accelerated Share Repurchase.

And in November and December 2023, we purchased approximately 466,000 shares of our common stock at an average price of $214.81 per share through a $100 million open market purchase, both under Align's current $1 billion stock repurchase program. We have $650 million remaining available for repurchase of our common stock under this stock repurchase program. Q4 accounts receivable balance was $903.4 million, slightly down sequentially. Our overall days sales outstanding was 85 days, flat sequentially and year over year.

Cash flow from operations for the fourth quarter was $46.9 million. Capital expenditures for the fourth quarter were $33.4 million, primarily related to our continued investments to increase aligner manufacturing capacity in facilities. Free cash flow, defined as cash flow from operations less capital expenditures, amounted to $13.5 million. Now, turning to our outlook.

Assuming no circumstances occur beyond our control, we provide the following framework for Q1 and fiscal 2024. For Q1 2024, we expect our worldwide revenues to be in the range of $960 million to $980 million, up slightly from Q4 of 2023. We expect Clear Aligner volume and ASPs to be up slightly sequentially. We expect Systems and Services revenue to be down slightly sequentially, although less than the historical seasonal decline, given the launch of the iTero Lumina for ortho workflows in Q1 2024.

We expect our Q1 2024 GAAP operating margin and non-GAAP operating margin to be slightly above Q1 2023 GAAP operating margin and non-GAAP operating margin, respectively. For full year, we expect fiscal 2024 total revenues to be up mid-single digits over 2023. We expect fiscal 2024 Clear Aligner and Systems and Services revenues to grow year over year in the same approximate range as our 2024 total revenues. We expect fiscal 2024 Clear Aligner ASPs to be up slightly year over year primarily due to price increases and favorable foreign exchange, partially offset by a higher mix of noncomprehensive products, which have lower ASPs.

We expect fiscal 2024 GAAP operating margin and non-GAAP operating margin to be slightly above the 2023 GAAP operating margin and non-GAAP operating margin, respectively. We expect our investments in capital expenditures for the fiscal 2024 to be approximately $100 million. Capital expenditures are expected to primarily relate to building construction and improvements as well as manufacturing capacity in support of our continued expansion. In summary, I am pleased with our fourth quarter and fiscal 2023 results, and I am especially proud of our continued focused execution of our product road map and innovation pipeline.

We are committed to delivering on our strategic growth drivers of international expansion, patient demand, orthodontist utilization and GP dentist treatment to extend our leadership in digital orthodontics and dentistry. I believe that the next wave of innovation that we are introducing into the market will further differentiate Align and allow us to continue to increase our share of the large untapped market opportunity of 22 million annual orthodontic case starts as well as an additional 600 million consumers who could benefit from a healthy, beautiful smile using Invisalign Clear Aligners. With that, I'll turn it back to Joe for final comments. Joe?

Joe Hogan -- President and Chief Executive Officer

Thanks, John. In closing, while I'm pleased with our better-than-expected fourth-quarter results and start to the year, I'm even more excited about Align innovation in 2024 and our next wave of growth drivers. When I spoke to you about a year ago, I discussed the innovations that we are planning to bring to market that we continue to revolutionize the orthodontic and dental industry and scanning software and direct 3D printing. We are delivering on that promise.

With the introduction of iTero Lumina powered by Multi-Direct Capture technology, we are pushing the boundaries of what intraoral scanners can do. iTero Lumina is a combination of years of research and development to offer visualization capabilities that support doctors, clinical decisions while also enhancing their patients' comfort and overall treatment experiences. Building on more than 20 years of expertise in revolutionizing imaging technologies, the iTero Lumina scanner elevates the standard in digital scanning to achieve exceptional clinical outcomes and increased practice efficiency. The iTero scanner is at the forefront of digital dentistry.

With the closing of our acquisition of Cubicure, a pioneer of direct 3D printing solutions for polymer additive manufacturing, we will enable the next generation of 3D printed products, helping to create more unique configurations for aligners that are more sustainable and also efficient solutions. We also expect it to extend and scale our printing materials and manufacturing capabilities for our 3D printed product portfolio, which now includes the Invisalign Palate Expander System. And with the introduction of IPE, we have expanded the clinical applicability of the Invisalign system to nearly 100% of the orthodontic case starts. The ability to direct 3D print, IPE will eventually lead to other direct printed products with the goal of direct 3D printed Invisalign Clear Aligners, which we hope to achieve in the next couple of years.

As a company, Align has multifaceted competitive advantage, technology innovation, where we invest up to $300 million in R&D per year to bring in some of the most disruptive products in digital dentistry and orthodontics to the market in a highly regulated industry. A direct sales force that consists of 5,000 highly trained specialists, a doctor-centered model because we understand the importance of doctor-directed care, a $1 billion brand trusted by over 17 million patients worldwide and global scale and manufacturing to deliver millions of customized Clear Aligner parts every day. We are extremely pleased with our latest innovations and commercialization of products to better serve our doctors, customers, and their patients. Our belief in the future business overall is unwavering.

Before we turn the call over to the operator, I want to address an important matter regarding DTC or direct-to-consumer Clear Aligners in our industry. Align has always believed that a doctor-centered model for orthodontic treatment is the safest for patients, and we're always looking for new and better ways to support doctors as they work to create better smiles for their patients. Recent news regarding the bankruptcy of a DTC clear aligner company has led many consumers to reach out to Invisalign providers to address their unmet needs, including helping those DTC patients with incomplete treatments. To support these former DTC patients who are seeking help from Invisalign providers and practices, in Q4 we introduced a program in the U.S.

and select other markets, offering up to a 50% off Invisalign case submission in Vivera Retention to help offset any additional cost to finish their treatment. We want to help everyone achieve a healthy beautiful smile and strongly recommend that individuals who are impacted by this matter seek the advice of a licensed orthodontist or dentist. Our concierge team is always available to answer questions and help connect consumers with Invisalign practices. With that, I'll thank you for your time today.

We look forward to updating you on our next earnings call. Now, I'll turn the call over to the operator for questions. Operator?

Questions & Answers:

Operator

Thank you. [Operator instructions] Our first question comes from Elizabeth Anderson with Evercore ISI. You may proceed.

Elizabeth Anderson -- Evercore ISI -- Analyst

Hi, guys. Congrats on the quarter. Thanks so much for the question. I was wondering if you could walk us through the components of the mid-single-digit guide.

I got -- for 2024. I understand what you said that like Systems and Services and Clear Aligners would be in the same range. I guess I'm just sort of thinking about like how to think about that. It seems like maybe it's like low single-digit ASP improvement and then sort of low to mid-single-digit case growth.

Is that the right way to think about it? Like what else can you -- is there anything else you can sort of clarify on that? And sort of how do you expect, at least currently, the sort of pacing of the year to progress?

John Morici -- Chief Financial Officer

Yeah. Elizabeth, this is John. You haven't framed it the right way. We're looking at the segments up mid-single digits and then ASPs because of the price increase.

We have some offset due to some of the lower-stage products that we have, including the DSP touch-ups and so on, that you would expect then a little bit lower of ASP impact year over year.

Elizabeth Anderson -- Evercore ISI -- Analyst

Got it. That makes sense. And then separately, how has the volume in sort of market in China been progressing across the fourth quarter and maybe into the first quarter so far as you can comment?

Joe Hogan -- President and Chief Executive Officer

Elizabeth, it's Joe. We felt good about China last year. But remember, we had year-over-year comparisons that were really favorable because of the COVID shutdowns over there last year. But overall, as we exited the year, we felt good about our performance there, and we feel good about as we move into 2024 about our competitive position there in -- a China market that I think is a little more predictable because it's not the overhead that we've seen with COVID over the last, really, several years.

Elizabeth Anderson -- Evercore ISI -- Analyst

Got it. And sorry, maybe one last one for me. Can you just remind us the sort of 1Q dip in the operating margins and then how it sort of steps up across the year? I understand the guidance you gave for the first quarter of the year, but just why that first quarter has a sort of different perspective than the rest of the year. Thanks.

John Morici -- Chief Financial Officer

Yeah. So, we wanted to give to prior year because, in that prior year, when you start the year, you have certain expenses that you incur right at the beginning, payroll, taxes, and other things that you incur initially some of the investments that you make that you then get leverage on as you go through the year. So, it's similar to how we position things from last year in 2023.

Elizabeth Anderson -- Evercore ISI -- Analyst

Perfect. Thanks so much, guys.

Operator

Thank you. One moment for questions. Our next question comes from Jeff Johnson with Baird. You may proceed.

Jeff Johnson -- Robert W. Baird and Company -- Analyst

Hey, thanks. Good afternoon, guys. Hey, can you hear me OK?

Shirley Stacy

Yes. We hear you fine.

Jeff Johnson -- Robert W. Baird and Company -- Analyst

All right. Great. John, maybe I want to -- I'll follow up on Elizabeth's margin question there beyond just the 1Q. Let's say, you hit your guidance this year on operating margin is up nominally from 2023 level.

It'd be three years in a row kind of in that low to mid-21% range. I think pre-COVID you were up in the 25% range or so. What's it going to take to get those margins moving back toward those pre COVID. You've taken price increases two years in a row.

It feels like your R&D should be coming down a little bit. Obviously, with Cubicure and that, I know you're continuing to invest aggressively, but IPE is out, Lumina now out, things like that. So, just help us understand when could we start to see a path back toward getting those margins maybe up a few points from where they've settled in the last few years?

John Morici -- Chief Financial Officer

Yeah. Jeff, this is John. Really, when you start to get some of that volume leverage, we're positioned as having our manufacturing and the organization that we have that's really set to drive more growth. And once we get some of that volume leverage, we should see that benefit showing up in our numbers.

And it's really what we saw as we went through the quarters last year where you see some of that volume benefit. You get that benefit as well when you go through the year, but really looking to try to drive as much volume as we can and you'll start to see some of that leverage that shows up in our numbers.

Jeff Johnson -- Robert W. Baird and Company -- Analyst

All right. Fair enough. And then, Joe, you know, I think we've talked for many years now how iTero is carved out such a commanding, strong competitive position. You've sold a ton of iTeros over the last five, six years or so.

They're all probably getting, I don't know, close to their end of their useful life or so. Lumina for the first time feels like that kind of product with a better form factor, especially things like that that could really cause some of these docs to say, I got to get rid of this big iTero and go back down to this much smaller one, and things like that, just things that would actually matter to the docs, and I'm sure the technology does this, too, I don't want to just put it on the size. But just thinking there, is this the kind of product that can finally kick off that multiyear upgrade strategy or path in iTero that we've kind of been waiting to see?

Joe Hogan -- President and Chief Executive Officer

You know, Jeff, the easy answer and the quick answer is yes. I mean, it's just a brand-new platform. Now, we set up -- I mentioned in my script about we have 100,000 units out there that we've sold so far. About a third of those are 5D pluses, which are upgradable by just wand switch out.

This is the way we've designed Lumina. And so, that part's easy. Also, we've been really aggressively upgrading our installed base between E1 and E2 out there, too, to better position it for this kind of a move. So, as we develop Lumina, we had exactly in mind what you just questioned, and we think we're in a good position to do that.

Jeff Johnson -- Robert W. Baird and Company -- Analyst

And if you switch out that wand from the five to the Lumina, there is a fee there, right? It's not like, hey, you bought this knowing that you could always upgrade at no charge to Lumina.

Joe Hogan -- President and Chief Executive Officer

There's no charity here at Align. There will be a charge.

Jeff Johnson -- Robert W. Baird and Company -- Analyst

I like to hear that. God bless capitalism. Thanks, Joe.

Operator

Thank you. One moment for questions. Our next question comes from Jon Block with Stifel. You may proceed.

Jon Block -- Stifel Financial Corp. -- Analyst

Hey, guys. Good afternoon. So, Joe, maybe this one's for you. Video 1Q '24 IPE some markets today, but more in the common IPE should have longer term with team, docs might take a little bit of a wait-and-see approach.

You talked about the new scanner. In your opinion, like is innovation are we seeing that in the '24 guide? Or is that more of like a ramp in the '25? And maybe even to take that a step further, John, for you, is there a way to sort of quantify out of that mid-single-digit revenue growth, what can you attribute to these new products coming on board in '24? I'm just trying to think about the impact of '24, is this more the ramp or the slope in the '25 for the innovation hitting?

Joe Hogan -- President and Chief Executive Officer

Jon, I like the way you set that up. It's a ramp, it really is. But we feel good that we can play offense with these product lines. Now, we still have to scale IPE.

We have a great team that knows how to scale, and we'll get through that. Obviously, Lumina is a completely different set outside of the computer itself. The wand itself is we feel good about the scale part of that as we sell through the marketplace. But overall, I think the way you described it is a ramp of this new technology really beginning in 2024 is a good foundation for that kind of thought process.

Jon Block -- Stifel Financial Corp. -- Analyst

And any way to quantify what's in there from the current guide or no? Is that just too difficult to tease out?

Joe Hogan -- President and Chief Executive Officer

It really is just too --

Jon Block -- Stifel Financial Corp. -- Analyst

OK. OK. So, second one is maybe a multipart. But just first on the capex, $100 million.

I mean, I was really surprised on how low that number was for this year. It's $400 million in '21, $300 million in '22 million, and I was maybe even more surprised when I think about the direct fabrication initiatives. So, I know the slides say hoping to print Invisalign Clear Aligner "next couple of years." Do we still think retainers 2H '24, 1H '25? When do we feel like you proved it out, so to say? And do we start to see gross margin benefits from this as early as next year, turning accretive in 2025? And then admittedly just a jump to another question. For the guidance, can you just help us what's embedded in there? And I bring that up because we've seen this big move in U.S.

consumer confidence. Europe still seems very choppy. So, when we tie back to your guidance for the year, what are you extrapolating out, if you would, for the current macro? Thanks, guys.

John Morici -- Chief Financial Officer

You know, I'll start with that, Jon, in terms of the current guidance. Look, we're looking at the environment that we're all in. It's not a great economy, most places, but it is more stable, and we're building off of that. And then as Joe said, we're doing things to play offense.

New products that we have with Lumina and IPE and so on, which we think, can help us grow in this environment.

Joe Hogan -- President and Chief Executive Officer

Jon, your question about the ramp-up, the margin piece or part of that, what's that mean in 2025 or whatever? Look, we feel confident, and as you know from our discussions and our analyst presentation last year is 3D printing is -- foundationally, it can be less expensive as we scale. And so, I mean, we'll start to see that come through as we scale that. But we need time to scale this. No one's ever had this polymer before that has a scale.

No one's ever used the Cubicure system to the degree that we need to use it. Now, we did this with 3D systems years ago because we basically scaled those systems through our team and team knows how to do that. I just can't tell you specifically within those in the next one to three years, with this being the first year, exactly when that really hits that hyperbolic side.

John Morici -- Chief Financial Officer

And just to close on the capex, those prior years, that was -- a lot of that was -- it was equipment. Of course, we are always adding capacity, but a lot of that was very much unique for buildings, adding buildings for our locations, manufacturing and so on. And when we add some of the capacity that we're adding for our manufacturing, it will go in existing buildings. So, we don't have to add another building in most cases for this.

So, that's why the capex is where it is.

Jon Block -- Stifel Financial Corp. -- Analyst

All good. Thanks for the color, guys.

Operator

Thank you. One moment for questions. Our next question comes from Brandon Vazquez with William Blair. You may proceed.

Brandon Vazquez -- William Blair and Company -- Analyst

Hi, everyone. Thanks for the question. On the guidance, maybe one other way I wanted to ask you and see if I could tease out a little bit of color on what's assumed here. If I kind of go back to some old sequentials in the teen side, assuming that's a little less susceptible to macro headwinds, you can probably kind of get to a low single-digit volume growth, I think, for the entire Clear Aligner business already, but probably not even including some DSP.

So, is that -- am I thinking about this correctly that really out of adults on a year-over-year basis for full year '24, you're really assuming kind of flattish, maybe even down depending on how teens and some of the DSP cases are doing?

John Morici -- Chief Financial Officer

I would characterize it, Brandon, this is John, that both teen and adult are positive on a year-over-year basis, expect maybe adults to grow faster as we've seen compared to -- teens grow faster than adults as we've seen in the past, but I would expect both of them to be up and show our numbers that way.

Brandon Vazquez -- William Blair and Company -- Analyst

OK. And then can you just reiterate maybe both for IPE and for Lumina? Exciting. It seems like they're going to ramp over the coming quarters. Are there any like key quarters and catalysts that we should think about that might take that up? You're talking about a ramp, but we get to the next level on the ramp on any of those when they go from maybe a limited launch to full market relief, anything like that? Thanks.

Joe Hogan -- President and Chief Executive Officer

Hey, Brandon, Joe again. On the Lumina side, remember, our restorative scanner for GPs comes out in the third quarter. But as like John indicated, we indicated, we feel we can sell that into the market now with the capabilities it has, but that will ramp in -- that will probably be more hinged to the regulatory approvals we have to get around the world. Right now, as I mentioned, we only have the United States and Canada and ANZ.

Secondly, on IPE, it's the same thing is we're regulatory constrained. We still have to go through Europe. And as I mentioned, IPE will come out in the second quarter in Australia and also. And as we gave that, obviously, we'll be scaling IPE too and understanding the dynamics around that.

So, it's more of a ramp, as I mentioned a few calls ago than anything.

Brandon Vazquez -- William Blair and Company -- Analyst

OK. Thanks, everyone.

Operator

Thank you. One moment for questions. Our next question comes from Jason Bednar with Piper Sandler. You may proceed.

Jason Bednar -- Piper Sandler -- Analyst

Hey there. Thanks for taking the questions. I'm going to pile on here on the guidance, just to focus there first. You mentioned noncomprehensive mix as being an offsetting factor to ASPs.

I know you've got that DSP factor. I had thought maybe originally you were signaling adults growing better than teens but doesn't seem like that's the case just given your comments there to Brandon. But I guess regardless on adults, are you seeing this market getting its footing back, it sounds like it, but if you are, what's giving you the confidence? Or what are you seeing that kind of the day-to-day or month-to-month that's showing adults are coming back into the office for treatment? And then sorry to load a few in here, but should we expect this faster noncomprehensive mix also to have gross margin benefits for the year as well? I think it typically does, but I don't think we've gotten kind of a gross margin cadence outlook for '24.

Joe Hogan -- President and Chief Executive Officer

Jason, I'll take the first part of your question and hand the rest off to John. We feel we're on a more stable, I'd call it, economic platform than last year. And so, the adult and teen question that you had is we expect that to carry through in 2024, as we indicated with our guidance, too. So, when I look back, everybody has a clear vision backwards than forward, we look back to last year, a pretty unstable platform that we experienced for the year and the third quarter was a tough one in that sense.

But I think we all see it right now. We have more confidence that at least we're dealing with stability from an economic standpoint in most parts of the world from what we see.

John Morici -- Chief Financial Officer

And on the noncomprehensive and gross margin questions and related to that, look, as we have the mix that shifts through and you might have an ASP lower on some of the non-comp DSP and others that fall into that. Those are our highest gross margin products from a rate standpoint. So, they're helpful for us as a business. It's really what that customer wants for him or her to run their practice and that's how we balance things out.

But overall, we expect that we would see benefits in gross margin just like we're talking about op margin year-over-year benefits, we should see a benefit as well in gross margin.

Jason Bednar -- Piper Sandler -- Analyst

All right. That's helpful. Thank you. And then for the follow-up here, I'll ask on teens.

It does look like you're back to gaining share against brackets and wires. It looks like the kind of the second consecutive quarter of that. I'm curious if you could talk maybe bigger picture, what's changed to what you think has changed over the last three to six months versus maybe the 12-plus months that preceded that. But do you think the share gains you're seeing versus brackets and wires, does that have to do with changes you made to that Teen Guarantee program middle part of last year? Or are there other items at the practice level or associated with your go-to-market activities that are driving that shift?

Joe Hogan -- President and Chief Executive Officer

You can always say that at Align, there's no single-variable equations. And this is another one. The Teen Guarantee, we think is some of it, obviously, our portfolio and how we put that together, our DSP programs, the uniqueness of Invisalign First. All those things really help.

And from an adult standpoint, with the firmer economic platform I talked about, I just think there's more confidence out there that we're starting to see bleed through.

Jason Bednar -- Piper Sandler -- Analyst

OK. Helpful. Thank you.

Operator

Thank you. One moment for questions. Our next question comes from Michael Ryskin with Bank of America. You may proceed.

Michael Ryskin -- Bank of America Merrill Lynch -- Analyst

Great. Thanks for taking the question, guys. I want to start with DSP kind of where you left off really successful, obviously, and you had great growth year over year for the whole year. But it's kind of moved in sort of like a step function.

If I just look at the numbers, 6,000, 7,000, 9,000 and then you're kind of like an 11,000, 12,000 range. Now, you're in the 18,000, 19,000, 20,000 range. Is there another step function coming next year? Is there -- could you dig into a little bit into what's driving that? And just sort of where do you see that going over the next couple of years?

John Morici -- Chief Financial Officer

Yeah. Michael, this is John. I would say as we look to expand this out, it's been successful, every place that we've done, we've seen, as you said, North America starts with this. So, you see some doctors start and then we have more and more doctors that sign up for the program.

And then as the doctors sign up for the program, they end up doing more and more volume with us. We've taken that same approach to other countries, and now we've introduced this in EMEA and other places. And the same thing happens. More and more doctors sign up for it.

They start to see the benefits of it, and then they utilize it more. So, it's really just a matter of now scaling this to other parts of the world because we find that this is really a nice way to supplement how a doctor wants to run their practice.

Michael Ryskin -- Bank of America Merrill Lynch -- Analyst

OK. And then maybe a follow-up on a few questions that were asked on Cubicure and Direct 3D printing earlier. Really exciting technology that you unveiled late last year, and definitely see the opportunity. But could you help walk us through the road map a little bit sort of like what should we be looking for as sort of goal post six months out, a year out, two years out, just to sort of track progress and see how it -- see how it's progressing?

Joe Hogan -- President and Chief Executive Officer

Michael, it's Joe again. I think the best way to describe it to you, it's -- like I said in my script, it's a one- to three-year journey. And obviously, we'll -- we know how to make these aligners now. We understand how to do it.

It's just a scalability of resin in the Cubicure process and that takes time. And we'll obviously report on it quarter by quarter. So, you really understand where we're going and what the hurdles are and what the opportunities are.

Michael Ryskin -- Bank of America Merrill Lynch -- Analyst

OK. Maybe if I could just tweak that a little bit. Is there -- just help us understand, is there anything in terms of -- when you talk about scalability of the resin and the polymer, if you're looking at comprehensive, noncomprehensive, you talked about retainers and being able to put those. Is there anything in terms of your portfolio that makes some products more amenable or would be amenable earlier than others? Or is this just going to be all or nothing?

Joe Hogan -- President and Chief Executive Officer

I mean, obviously, the scale, you look at retainers first because units of one. And that's why you'd end up with comprehensive full cases in some way. And that's basically how we'll ramp.

Michael Ryskin -- Bank of America Merrill Lynch -- Analyst

OK. Great. Thanks, guys.

Operator

Thank you. One moment for questions. Our next question comes from Nathan Rich with Goldman Sachs. You may proceed.

Nathan Rich -- Goldman Sachs -- Analyst

Good afternoon. Thanks for the questions. I wanted to ask on the Systems and Services revenue guidance for 2024. This looks low to me just given -- I think growth in '23 was basically flat, up slightly.

With the Lumina launch, we thought it would maybe be up more than it was in 2023. So, I don't know if you could just maybe elaborate on what you're expecting for that segment.

John Morici -- Chief Financial Officer

Nate, this is John. We're looking at -- like we said, this year, you're kind of in that mid-single digits. We do have Lumina, which helps, but there's also unknowns about the macro economy. We were very pleased with what we saw in the fourth quarter with doctors buying and actually doing better than what we had really guided to.

So, we're pleased with the performance of Q4, but we just want to make sure that as we ramp up Lumina that we're properly positioned there, and we'll update as we go along.

Nathan Rich -- Goldman Sachs -- Analyst

OK. Great. And then just going back to the margin cadence, I guess are there any either upfront or one-time costs associated with either the launches of Lumina or IPE that impact the margin in the early part of the year just as we think about cadence and sort of what the right baseline is.

John Morici -- Chief Financial Officer

There is some of that in Q1. We're ramping that up. So, it's not a big, huge splash where there's a lot of expenses and kind of hits all in one quarter. But there is some ramp-up, but that's factored into our guidance.

So, when we say that we expect the year over year in the first quarter to be slightly up, it's factored in -- those expenses are factored in.

Nathan Rich -- Goldman Sachs -- Analyst

Great. Thank you.

Operator

Thank you. One moment for questions. Our next question comes from Erin Wright with Morgan Stanley. You may proceed.

Erin Wright -- Morgan Stanley -- Analyst

Great. You mentioned at the end of the call, some of the DTC customers that you are tailoring some of the offerings to. I guess, was this material at all in the quarter? Maybe it's not large enough at this point, but any sort of contributions in 2024 as we think about picking up some of that business? And then also, DSO relationships, has there been any changes there in terms of the relationships on that front? How would you characterize those at this point? Are you seeing any greater traction there? Do some of these new products really move the needle on some of those relationships or conversations you're having? Thanks.

Joe Hogan -- President and Chief Executive Officer

On the DTC customers, we've always argued that that wasn't our marketplace in the sense of the price point and all. But I mean, obviously, these patients will pursue treatment. Now, probably more so for doctors than DTC. And we're just doing what we can in order to support those customers going forward.

But again, as I was clear in my script, we're a doctor-focused client company, and we'll keep it that way. But we do see this as being a certain opportunity. It's just hard for us to quantify right now. On the DSO relationships, I'd say this has gotten stronger all around the globe.

Two to call out would be Heartland and Smile Docs, Smile Docs being more new ortho side and Heartland being more on the GP side. But we have really good relationships, and we leverage our portfolio well with them to help them grow and we grow with them. So, I feel good about our position with DSOs, and we have good strong relationships out there with them.

Erin Wright -- Morgan Stanley -- Analyst

OK. Thank you.

Operator

Thank you. One moment for questions. Our next question comes from Brandon Couillard with Jefferies. You may proceed.

Brandon Couillard -- Jefferies -- Analyst

Thanks. Good afternoon. Joe, given the positive macro shift we've seen in the last few months with consumer confidence coming back, any chance you can comment on what you've seen in case starts in January an inflection? And then with respect to the '24 growth outlook. Any chance you could break that out between Americas and International?

Joe Hogan -- President and Chief Executive Officer

Yeah. I can't -- I really wouldn't break it out between Americas and International because we felt good about the geographies in general as you went across the world for, especially, latter half of the fourth quarter of last year. As we go into this year, as I talk about, we're looking at, I think, a stable economic platform. Some of the data that you cited would support that overall.

And we feel good about our new products. We think we can play offense. And that's what we're focused on right now.

Brandon Couillard -- Jefferies -- Analyst

OK. And then one housekeeping one for you, John. The fourth quarter operating cash flow was pretty weak. Can you just unpack any of the moving parts that might have been one-time in the quarter? It looks like there was a spike in prepaid expenses on the balance sheet.

But anything you would call out?

John Morici -- Chief Financial Officer

Things that related to like tax payments and things. It's just some timing as things go through the year. But we feel great. I mean, it's a great model.

It generates a lot of cash. It gives us a lot of flexibility, and we were able to use that cash, that $350 million buyback that we did last quarter.

Brandon Couillard -- Jefferies -- Analyst

Gotcha. Thank you.

Operator

Thank you. And we have reached the end of our question-and-answer session. I will now turn the call back over to Shirley Stacy for closing remarks.

Shirley Stacy

Thank you, everyone. We appreciate you joining us today. We look forward to speaking with you at upcoming financial conferences and at industry meetings such as Chicago Midwinter. If you have any questions or follow-up, please contact our Investor Relations.

Thanks, and have a great day.

Operator

[Operator signoff]

Duration: 0 minutes

Call participants:

Shirley Stacy

Joe Hogan -- President and Chief Executive Officer

John Morici -- Chief Financial Officer

Elizabeth Anderson -- Evercore ISI -- Analyst

Jeff Johnson -- Robert W. Baird and Company -- Analyst

Jon Block -- Stifel Financial Corp. -- Analyst

Brandon Vazquez -- William Blair and Company -- Analyst

Jason Bednar -- Piper Sandler -- Analyst

Michael Ryskin -- Bank of America Merrill Lynch -- Analyst

Nathan Rich -- Goldman Sachs -- Analyst

Erin Wright -- Morgan Stanley -- Analyst

Brandon Couillard -- Jefferies -- Analyst

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Align Technology (ALGN) Q4 2023 Earnings Call Transcript was originally published by The Motley Fool