How long does Invisalign take?

Between three months and eighteen. That is an honest answer and not a very useful one, so here is what actually decides it, what the typical times are for each of our packages, and what you can do to keep your own treatment on schedule.

By Dr Louise Gidda · Platinum Elite Invisalign provider
Updated October 2026 · 6 min read

Clinically reviewed by Dr Louise Gidda BDS MFGDP RCS (Eng)GDC No. 78061October 2026

What decides the length

Teeth move about a quarter of a millimetre per aligner, and each aligner is worn for one to two weeks. So the length of treatment is set by how far the teeth that have to travel furthest need to move, plus the time needed to stage the movements in the right order. A single rotated incisor is a few aligners. Closing a deep bite, expanding both arches and unravelling crowding is many more, because some movements have to finish before others can start.

A treatment plan on screen showing each stage of aligners, with a stack of aligner pouches beside it

Typical times by package

Package	Aligners	Typical time	Typical case
Express	Up to 7	3 to 4 months	One tooth, a small gap, a minor relapse
Lite	Up to 14	6 to 7 months	Mild crowding or spacing, usually the front teeth
Moderate	Up to 20	9 to 12 months	Moderate crowding or spacing across both arches
Comprehensive	Unlimited	12 to 18 months	Bite correction, complex crowding, open bites

These are the aligner-wearing times. Add three to four weeks at the start for planning and manufacture after your consultation, and a short set of refinement aligners at the end in many cases.

What makes it faster

Wear. Twenty to twenty-two hours a day. This is the single biggest factor, and it is in your hands. Teeth that are not held in the aligner drift back, the next aligner does not fit, and the plan slips.
Changing on time. Louise sets the interval for your plan, usually seven to fourteen days. Dental Monitoring confirms each aligner has seated so you can move on with confidence.
Chewies. Biting on the small foam chewies for a few minutes a day helps each aligner seat fully, which keeps the teeth tracking the plan.
Good planning. A plan that stages the movements in the right order avoids the stalls that add months. That is Louise's job, and it is where experience shows.

What makes it slower

Missed hours, mostly. Also teeth that are slower to move than the computer predicted, which is normal and is why refinements exist; gum or bone that needs treating before aligners can start; a lost aligner that is not reported; and, in older adults, bone that remodels a little more slowly. None of these are disasters, and the monitoring catches them early.

A date to work towards

Weddings are the deadline we are given most often. Starting early is the only reliable strategy: a Lite case begun nine months before the day finishes with time for whitening and for the retainers to settle in. Our wedding planner page compares a given date with typical treatment times for each package, with the honest caveat that it cannot predict your own finish date. If the date is close, a short course on the front teeth may be the sensible aim rather than the complete plan, and Louise will say so.

And afterwards

Treatment ends; retention does not. Retainers are worn nightly for the first year, then a few nights a week indefinitely. Your Vivera retainers are included, and twelve months of aftercare reviews check the result is holding.

Questions people ask

How long does Invisalign take for crowding?

From six or seven months for mild crowding to twelve to eighteen months for complex crowding across both arches.

How long does Invisalign take for one tooth?

Usually three to four months, as an Express case.

Does Invisalign take longer than braces?

No. Treatment times are similar for similar cases; what differs is the daily experience and the number of visits.

How often do I change aligners?

Every one to two weeks, as Louise directs. Dental Monitoring confirms each one has seated before you move on.

Can treatment be sped up?

The best accelerator is wearing the aligners for the full hours and changing on time. We do not use devices that claim to speed tooth movement; the evidence for them is weak.

Dr Louise Gidda BDS MFGDP RCS (Eng)

Your local Invisalign expert: a Platinum Elite Invisalign provider at Clear Braces Solihull, Omnia Dental Spa, with more than twenty-five years of orthodontic experience and 4,250+ cases. GDC No. 78061.

Sources and further reading

This guide is general information and reflects guidance from the NHS, the General Dental Council, the Oral Health Foundation, the British Orthodontic Society and Align Technology. It is not a substitute for an examination. Book a consultation for advice about your own teeth.