3D Smile Simulations: How Dentists Visualise Your Projected Results Before Treatment

Being shown a projection of your own teeth in their planned final position is a genuinely useful moment. It turns an abstract conversation about crowding and rotation into something you can look at and respond to, and it lets you say what you actually want before any treatment begins.

It is also frequently misunderstood. A simulation is a plan rendered visually, not a photograph of the future. Knowing the difference between those two things is what allows you to use it well — as a decision-making tool rather than a promise.

This article explains how a simulation is produced, what it reliably represents, what it cannot account for, and how clinicians use it when planning aligner treatment.

What is a simulation actually showing me?

It shows your own teeth, captured by an intraoral scan, repositioned by planning software according to the movements your clinician has prescribed. The software applies known limits on how far and how fast teeth can move, then renders the projected end point and the stages in between. It is a modelled projection of a planned outcome, based on your actual anatomy — not a rendered ideal, and not a promise of the result you will finish with.

Everything starts with an accurate record. A handheld intraoral scanner captures your teeth and gums in three dimensions in a few minutes, without impression trays or setting material. If you have not encountered one, our article on digital scans compared with putty impressions covers what the appointment involves.

Alongside the scan, planning usually requires clinical photographs, X-rays to assess root position and bone levels, and a full examination of your gums and bite. The scan records surfaces; it does not show roots or bone, which is why the imaging matters. A simulation built without that supporting information is a cosmetic mock-up rather than a treatment plan.

• The projected final position of each tooth, viewed from any angle

• A stage-by-stage animation of how the teeth are planned to move

• Where crowding resolves, where spaces close, and where the arch changes shape

• Which teeth are planned to rotate, tip or move vertically, and by roughly how much

• Where attachments may be needed on particular teeth to achieve a movement

• Whether interproximal reduction — creating small amounts of space between teeth — forms part of the plan

That last pair is worth attention. Attachments and interproximal reduction are common in aligner treatment and both should be explained and consented to before you begin, not discovered mid-course.

The software is not simply moving shapes around. It works within biological constraints: teeth move through bone at a limited rate, roots have to remain within the bone envelope, and certain movements — significant rotations of round-rooted teeth, large vertical changes, bodily movement of roots — are considerably less predictable than simple tipping.

A clinician then reviews and adjusts the proposed plan. That review is the substantive part. Software can propose a sequence that looks tidy on screen but asks too much of a particular tooth, or ignores a periodontal limitation, or produces an end position that does not work with how your teeth actually meet. Adjusting for those factors is clinical judgement, not computation, and it is why a named dentist should be responsible for your plan rather than a remote algorithm.

• Exact timing. Teeth move at individual rates. The projection assumes ideal wear and typical biology.

• Your compliance. Aligners work when worn 20–22 hours a day. A simulation cannot model the days they spend in a pocket.

• Soft tissue behaviour. Lips, cheeks and the way your gums drape over repositioned teeth are approximated at best.

• Gum recession or bone limits. Where support is already reduced, achievable movement is more restricted than the model suggests.

• The colour and shape of your teeth. Simulations typically render teeth in a uniform shade. They are not a preview of whitening or composite bonding, even where the images look convincing.

• Unplanned events. A tooth that tracks off-plan, an attachment that debonds, or a change in your dental health during treatment all alter the course.

Treat any simulation presented as a certainty with caution. It is a projection, and the accompanying explanation should say so.

In practice, the simulation serves three purposes. It is a communication tool, letting you see and question the proposed outcome before committing. It is a planning document, defining each stage and the appliances needed. And it is a reference point during treatment: at review appointments, your dentist compares where the teeth actually are with where the plan expected them to be, and refines the sequence if they have diverged.

That comparison is why mid-course refinement is normal rather than a sign of failure. Ask before you start whether refinements are included in your fee, and get the answer in writing. Our ProAligner treatment plans set out what each option covers.

Arrange an assessment if:

• Your teeth have crowded or spaced over time and you want to know what is achievable

• You are weighing aligners against fixed braces

• You have been offered a remote or online plan and want an in-person examination

• Your gums bleed, or you have not had a check-up recently — this needs resolving before any movement

• You are planning veneers or bonding and want to know whether alignment should come first

• You have had orthodontic treatment before and your teeth have relapsed

Any assessment should include a periodontal examination and X-rays, not just a scan. Moving teeth with untreated gum disease or active decay risks real harm.

Wear time is the single factor most within your control, and the projection assumes you meet it. Beyond that: keep to your review appointments so divergence is caught early, maintain hygiene visits throughout, and clean thoroughly before reinserting trays.

Plan for retention from the outset. Teeth drift back after any orthodontic treatment, and the simulation's end point is only maintained if it is held there — with a removable retainer, a fixed retainer, or both. Anyone discussing alignment without discussing retention is describing half the treatment.

• A simulation repositions your own scanned teeth according to a prescribed plan

• It is a projection of an intended outcome, not a promise of the final result

• Supporting X-rays and a gum examination are essential, since scans show surfaces only

• Clinical review of the software's proposal is the part that matters most

• Timing, compliance, soft tissue and gum support are not reliably modelled

• Simulations do not preview tooth colour, bonding or veneers

• Ask in writing whether refinements and retainers are included before you commit

The NHS publishes general guidance on braces and orthodontics for patients considering treatment.

A 3D simulation is one of the more genuinely helpful developments in orthodontic planning. It makes the proposed outcome discussable, it exposes what the treatment will involve, and it gives you a basis for asking better questions before committing.

Its value depends on what sits behind it. A simulation supported by a full examination, X-rays and a named clinician's judgement is a treatment plan. One produced from a scan alone, presented as a finished result, is marketing.

To discuss whether alignment suits your case and see what is realistically achievable, book a consultation at 22 Wimpole St, London W1G 8GQ, or call 020 7183 0692.

Dental symptoms and treatment options should always be assessed individually during a clinical examination.

This article is for general educational information only and is not professional dental advice, diagnosis, or a treatment recommendation. Information here is general and cannot replace an in-person assessment by a qualified, GDC-registered dental professional. Symptoms, suitability, fees, timelines, and outcomes vary according to individual clinical circumstances. If you have pain, swelling, or other concerning symptoms, seek prompt professional dental care. Always request a written treatment plan and cost estimate before proceeding with treatment.

Written Date: 8 September 2026 Next Review Date: 8 September 2027