Invisalign in Turkey: the one dental treatment we advise against travelling for
Body Expert arranges dental treatment in Istanbul for British patients, and clear aligners are the one thing we tell people to have done at home. The reason has nothing to do with the standard of Turkish clinics or with the aligners themselves, which come from the same manufacturer wherever they are prescribed. It has to do with what the treatment is: a course of supervised tooth movement that runs for 6 to 18 months after the trays are made, not a procedure that is finished when you fly home.
That course has a rhythm. The trays are worn 20 to 22 hours a day, a new set goes in at home every 7 to 14 days, and the person who prescribed the plan needs to see the teeth in a chair every four to ten weeks, which is the interval the British Orthodontic Society gives patients for orthodontic treatment generally. A three-day trip to Istanbul buys the scan, the treatment plan and the first trays. It does not buy the year that follows, and that year is where aligner treatment succeeds or comes apart.
Why aligners travel badly when crowns and implants do not
Most of the dental work people fly for has a defined end. A course of crowns, a set of veneers, an implant with its healing period: the chair time is planned in advance, it happens during the stay or across two stays, and the result is in the mouth when you leave. That is the shape of the dental treatments we organise in Istanbul, and it is why they suit travel.
Aligner treatment has the opposite shape. The chair time is spread thinly across the whole of the year, in short appointments whose content cannot be predicted in advance. At a review the clinician checks whether the teeth are following the plan, rebonds attachments that have come off, reduces a fraction of a millimetre of enamel between teeth where the plan calls for it, and decides whether to carry on with the existing trays or scan again and order a new series. Each of those decisions depends on what the teeth have actually done since the last visit, which is precisely what a photograph struggles to show.
How a course of clear aligners actually runs
Invisalign is a brand of clear aligner owned by Align Technology, the American company that introduced the system in 1999 and reports having treated more than 23 million patients since. The generic appliance behind the brand is a clear removable tray, and several manufacturers make them; a clinic advertising the brand name is telling you which laboratory produces its trays, not which technique it uses.
Treatment begins with an intraoral scan, taken on an iTero scanner in the case of this brand, from which the prescribing clinician builds a digital plan in the ClinCheck software. The plan splits the distance between the teeth as they are and the teeth as they should end up into a series of small steps, one tray per step. You then wear the trays in order, removing them to eat, to drink anything other than water and to brush.
What the software shows you at the consultation is a projection rather than a promise. When Kravitz and colleagues (2009) superimposed planned positions on the positions actually achieved across 401 anterior teeth, the mean accuracy of movement came to 41 per cent, with extrusion of an upper central incisor the least predictable movement of all. The materials and protocols have moved on since that study, but the principle it established has not: the last trays in a series rarely finish the job on their own, and an additional series, usually called a refinement, is a routine part of the treatment. Somebody has to scan for it, order it and fit it.
The attachments are part of the appliance
Clear aligners are often described as the option with nothing stuck to your teeth, which is only half right. Most plans rely on small tooth-coloured composite bumps bonded to the visible surface of several teeth, which give the tray something to push against for movements it could not otherwise produce. They are placed at the start, they are removed and polished at the end, and in between they occasionally come off, at which point the tray stops fitting properly and tracking suffers until someone bonds a new one.
Where those bumps sit on ceramic rather than on enamel, the bond becomes a technical problem in its own right. A systematic review of laboratory studies by Kaur and colleagues (2026) found that attachments bonded to aesthetic crown materials need a specific surface treatment, hydrofluoric acid etching followed by a composite resin, to reach a respectable shear bond strength. If you already wear veneers or crowns on the teeth the plan intends to move, that detail belongs in the conversation while the options are still open.
What the treatment asks of you
The appliance only works while it is in your mouth, and the wear target is high enough that ordinary life gets in the way of it. Twenty to twenty-two hours a day leaves roughly two hours for all meals, hot drinks and anything else that means taking the trays out, and the trays have to go back in immediately afterwards rather than at the end of the evening.
How well people manage this has been measured. Timm and colleagues (2021) classified 2,644 adults who had completed aligner treatment with a single provider according to their recorded wear: 36 per cent were fully compliant, 38.3 per cent fairly compliant and 25.7 per cent poorly compliant. That last quarter is the population in which plans stop tracking, and it is worth knowing which of the three groups you are likely to join before you choose a clinician in another country.
Comfort is a smaller matter, though it is one patients ask about. Cardoso and colleagues (2020) reviewed the evidence comparing aligners with fixed braces and found lower pain levels with aligners during the first days of treatment, with the difference disappearing thereafter. The British Orthodontic Society puts the same thing plainly for patients starting any orthodontic treatment: “a degree of discomfort is likely to start with”. Each new tray produces a day or two of tightness, which is the appliance doing its job.
The appointments you cannot post
Clinics that treat international patients present the schedule as one trip, occasionally two. The first covers the examination, the scan, the plan and the bonding of attachments, the second covers the end of treatment. Everything in between is handled by photographs sent from home.
Set that against the schedule the treatment is built on.
| Stage of treatment | What it requires |
|---|---|
| Daily wear | 20 to 22 hours, every day |
| Changing trays | A new set every 7 to 14 days |
| Clinical review | Every four to ten weeks |
| Active phase | 6 to 18 months in total |
| Refinement series | Common, needs a new scan |
| Retention | Retainers, for the long term |
The British Orthodontic Society is direct about what that rhythm implies: “It is not advisable to start treatment if you know you will not be able to keep these appointments.” The NHS quotes a similar interval for fixed braces, with an appointment every six to eight weeks to adjust them. Nothing about aligners removes the review; it changes what happens at it.
Remote monitoring is the answer the market has produced to that objection, and it does real work without yet replacing the chair. Ferlito and colleagues (2023) tested an artificial-intelligence monitoring application used by patients in clear aligner treatment and scanned each patient twice with it. The application agreed with itself on the overall instruction, carry on or stop, in 83.3 per cent of cases, but the two scans never once agreed on which teeth were failing to track. Patients told to carry on had discrepancies between planned and actual tooth position of the same size as those told to stop. Photographs from home are useful for spotting that something is wrong. Deciding what to do about it is still a clinical judgement made in front of the patient.
When the case is beyond an aligner
This is the question a quotation answers last and the one that should be settled first, because the honest answer for a minority of patients is that a tray cannot do the job.
The systematic review by Papadimitriou and colleagues (2018) places clear aligners on mild to moderate malocclusion in patients who have finished growing and whose treatment does not require extractions. Within that range they level, tip and derotate teeth predictably, canines and premolars excepted. Outside it, the review records limited efficacy in closing extraction spaces, in correcting occlusal contacts and in larger anteroposterior and vertical discrepancies. Rossini and colleagues (2015) reached the same conclusion from the other direction, reporting around 30 per cent accuracy for extrusion and poor control of rotation in rounded teeth.
Patients are told the same thing, without hedging, in the public guidance of the British Orthodontic Society: “In the more severe cases, notably those where extractions are required, aligners lack the necessary control of the teeth to give consistently good results and often lead to disappointment.” Cases like these are treated with fixed appliances, sometimes with extractions, occasionally with a joint orthodontic and surgical plan. A clinic that has quoted you for aligners before a full assessment has not yet told you which group you are in, and a second opinion is considerably easier to obtain in the town where you live.
There is also a middle group worth naming. Ke and colleagues (2019) compared aligners with fixed braces across eight studies and found shorter overall treatment time with aligners, alongside weaker control of torque, less reliable occlusal contacts and more relapse. For a patient whose case sits at the boundary, that trade-off is the conversation to have, and it is not one that survives translation into a package price.
Aligners and the rest of your dental work
Where restorative work is also planned, the order matters. Dental implants are fixed in bone and do not move, so the teeth around them are moved with the implant treated as a fixed point, and any bone grafting has to be finished and healed first. Crowns and bridges are usually completed after the alignment rather than before it, since moving a tooth changes how a new crown should be shaped, while old restorations that will be replaced anyway are the least of the difficulties.
Veneers are the awkward case. A patient already wearing them who needs orthodontic work faces the bonding problem described above, and a patient considering both has a genuine choice to make about sequence, because alignment first often means fewer or thinner veneers afterwards. That decision belongs to a clinician who can examine the teeth.
Retainers: the part with no end date
Teeth drift back towards their old positions once the trays come out for good, which makes retention a permanent part of the plan. The Cochrane review by Martin and colleagues (2023) brought together 47 randomised trials and 4,377 participants on retention after braces and found no retainer type clearly superior to another, with most of the evidence rated low or very low certainty. What is not in doubt is that retention is needed, and that it is needed for a long time. The British Orthodontic Society tells patients that teeth take “at least a year for the jawbone and gums to settle” and that they should expect “lifelong wear if the teeth are to stay in their new place”.
For a treatment carried out abroad, this is the practical question that outlives all the others. Retainers wear out, crack and get lost, and the clinic that holds your digital records is the one that can reproduce them quickly. A patient who finished treatment in another country years earlier is starting again with whoever they can find at home.
If you are set on treatment abroad anyway
Some patients will weigh all of this and still prefer to be treated overseas, often because they spend part of the year there. In that situation, the questions below are worth settling in writing before any payment, since each one names a cost that surfaces later rather than at the quotation stage.
- Who is the clinician holding the prescription, what is their orthodontic qualification and where are they registered? In the UK, only practitioners on the General Dental Council’s specialist list may call themselves specialist orthodontists.
- How many in-person reviews does the plan assume, and where will each of them take place?
- If the teeth stop tracking, who pays for the new scan and the refinement series, and how soon can it be produced?
- Who supplies the retainers at the end, and who replaces them in three years’ time?
- What written record of the plan, the scans and the attachments will you be given, so that a clinician at home can take the case over if it comes to that?
A clinic that answers all five without hesitation is a serious one. Our comparison of destinations for dental treatment goes through the same checks for the treatments that do travel well, which for us means the work that starts and finishes within a planned stay, backed by twelve months of post-treatment follow-up. Clear aligners are where we draw the line, because the more demanding half of that treatment takes place at home, months after the flight back, and it belongs with a clinician you can see.
Sources
Align Technology. (n.d.). About Align Technology. Retrieved 13 September 2026, from https://www.aligntech.com/about
British Orthodontic Society. (n.d.). Frequently asked questions. Retrieved 13 September 2026, from https://www.bos.org.uk/patients/treatments/faqs/
Cardoso, P. C., Espinosa, D. G., Mecenas, P., Flores-Mir, C., & Normando, D. (2020). Pain level between clear aligners and fixed appliances: A systematic review. Progress in Orthodontics, 21(1), 3. https://doi.org/10.1186/s40510-019-0303-z
Ferlito, T., Hsiou, D., Hargett, K., Herzog, C., Bachour, P., Katebi, N., Tokede, O., Larson, B., & Masoud, M. I. (2023). Assessment of artificial intelligence-based remote monitoring of clear aligner therapy: A prospective study. American Journal of Orthodontics and Dentofacial Orthopedics, 164(2), 194-200. https://doi.org/10.1016/j.ajodo.2022.11.020
Kaur, A., Soans, C. R., Ravi, M. S., & Shilpa, M. (2026). Evaluation of bonding of clear aligner attachments on aesthetic crown materials: A systematic review of in vitro studies. Frontiers in Dental Medicine, 7, 1888333. https://doi.org/10.3389/fdmed.2026.1888333
Ke, Y., Zhu, Y., & Zhu, M. (2019). A comparison of treatment effectiveness between clear aligner and fixed appliance therapies. BMC Oral Health, 19(1), 24. https://doi.org/10.1186/s12903-018-0695-z
Kravitz, N. D., Kusnoto, B., BeGole, E., Obrez, A., & Agran, B. (2009). How well does Invisalign work? A prospective clinical study evaluating the efficacy of tooth movement with Invisalign. American Journal of Orthodontics and Dentofacial Orthopedics, 135(1), 27-35. https://doi.org/10.1016/j.ajodo.2007.05.018
Martin, C., Littlewood, S. J., Millett, D. T., Doubleday, B., Bearn, D., Worthington, H. V., & Limones, A. (2023). Retention procedures for stabilising tooth position after treatment with orthodontic braces. Cochrane Database of Systematic Reviews, 2023(5), CD002283. https://doi.org/10.1002/14651858.CD002283.pub5
National Health Service. (n.d.). Orthodontics. Retrieved 13 September 2026, from https://www.nhs.uk/conditions/orthodontics/
Papadimitriou, A., Mousoulea, S., Gkantidis, N., & Kloukos, D. (2018). Clinical effectiveness of Invisalign orthodontic treatment: A systematic review. Progress in Orthodontics, 19(1), 37. https://doi.org/10.1186/s40510-018-0235-z
Rossini, G., Parrini, S., Castroflorio, T., Deregibus, A., & Debernardi, C. L. (2015). Efficacy of clear aligners in controlling orthodontic tooth movement: A systematic review. The Angle Orthodontist, 85(5), 881-889. https://doi.org/10.2319/061614-436.1
Timm, L. H., Farrag, G., Baxmann, M., & Schwendicke, F. (2021). Factors influencing patient compliance during clear aligner therapy: A retrospective cohort study. Journal of Clinical Medicine, 10(14), 3103. https://doi.org/10.3390/jcm10143103