How long clear aligner treatment takes in the UK

The quickest way to straighten teeth depends on how much needs to move. For a small change to the front teeth, a limited plan can be quick: the Inman aligner's manufacturer says most suitable cases finish in 6 to 16 weeks, and a short course of clear aligners can take a few months. Correcting how the teeth bite together, across the whole mouth, usually takes one to two years, whatever the appliance. A short plan is quick because it changes less, and the British Orthodontic Society warns that very short treatment can leave roots out of place and teeth more likely to move back. An orthodontist or dentist who has examined you can tell you which kind of plan your teeth need.

Limited front-tooth change or full bite correction

The British Orthodontic Society's FAQ says simple straightening can sometimes be done in as little as six months, particularly if only the front six teeth are involved, but that a short treatment like that usually produces limited changes. There may not be time to move the whole tooth, including the root. The teeth may move back once the brace comes off. It says it often takes one to two years to get the teeth biting together well, in harmony with the jaws and lips, and longer for more difficult problems.

So the first question for any quick plan is what it is aiming to change. A limited plan lines up the visible front teeth. A comprehensive plan also corrects the bite. Both are legitimate, but they are not the same job, and the time quoted only makes sense alongside the goal.

How long the options usually take

These are the published ranges, for the kinds of case each is used for. They are not interchangeable: a faster option may simply not be suitable for your teeth.

Invisalign says mild to moderate cases often finish in 12 to 18 months, and more involved cases take longer. Some remote aligner companies advertise shorter averages for their own cases, such as 3 to 6 months for full-time wear. Those figures describe the cases each company accepts, which are usually mild, and are not a promise for yours. Providers estimate longer for night-only plans; Smile Perfect, for example, quotes 6 to 9 months for night-time aligners against 3 to 6 for daytime. These are company estimates, not a clinical rule.

Where the time actually goes

Treatment length is more than the time spent wearing trays. With aligners, plan for each stage:

1. Assessment and records. An examination, scan or impressions, and X-rays where needed. Any decay or gum problems are treated first, which can add weeks.
2. Planning and manufacture. A treatment plan to approve, then the trays are made. Smile Perfect, for example, says aligners ship within 10 to 16 working days of approving the plan, and about 4 to 6 weeks from buying the impression kit. A failed impression adds a retake.
3. Active movement. The months on the plan, with check-ins. This is the figure most often quoted.
4. Refinements. If teeth do not move as planned, extra trays add time. Falling short of the planned result is a recognised risk.
5. Retention. Retainers start when active treatment ends and continue long term.

What makes treatment take longer

• Not wearing the trays for long enough. The British Orthodontic Society advises more than 22 hours a day, and treatment takes longer when aligners are not worn as instructed.
• Moving to the next tray too early. A tray that does not fit will not move teeth as planned, and catching up costs more time. See mistakes that affect clear aligner treatment.
• Lost or broken trays and missing attachments, which need replacing before you can carry on.
• Teeth that do not follow the plan, leading to refinements or a different appliance; see when clear aligner treatment goes wrong.
• Waiting lists. NHS orthodontics for under-18s can involve a long wait to see an orthodontist.

If you have a deadline

For a wedding or another fixed date, tell the clinician before treatment starts and ask:

• Can the change I want be done by then, or only part of it?
• How long will assessment, planning and manufacture take before I start wearing trays?
• What happens to my plan if I need refinements close to the date?
• Will attachments or elastics be visible on the day, and can trays be removed for photos?

Do not shorten wear time, or move through trays faster, to meet a date. That tends to make treatment longer, not shorter. If the time is too short for the result you want, it may be better to start after the date, or to plan a limited change first.

After the last aligner

Teeth are not fixed in place when the last tray comes out. Retainer wear is long term, whichever appliance moved the teeth. How that works day to day is in care after clear aligners. The Inman option is explained in what an Inman aligner is, and the fees for each route in what clear aligners cost in the UK.