At a glance
There is no upper age limit for clear aligner treatment, and more and more adults are having their teeth straightened. For adults, the gums come first: gum disease is treated before any tooth is moved. The rest depends on the teeth already treated and on whether you can wear the trays for most of the day.
Is there an age limit for clear aligners?
No. Gentle, continuous pressure can move teeth at any age, and that does not stop at 25. The condition for doing it safely is healthy gums and bone, or gums stabilised after treatment. More and more adults are in fact choosing orthodontic treatment.
The difference from a teenager is the starting point. At 35 or 45, a mouth has a history: treated teeth, sometimes a missing tooth, gums that may have receded. That history is what the examination reads before saying yes or no.
One thing does change with age: the jaws have stopped growing. A marked mismatch between the upper and lower jaw can no longer be corrected by guiding growth, so depending on how large it is, it may call for another kind of treatment, sometimes surgery.
Why do adults seek treatment at 30 or 40?
The reasons that come up most often:
- teeth that have shifted over the years, often lower front teeth slowly overlapping;
- teeth straightened in the teens that have moved again (see the guide to teeth that move after orthodontic treatment);
- a gap that has opened between the front teeth;
- plans for veneers, crowns or an implant that first need some teeth moved into place (see the guide comparing veneers and aligners);
- the wish for a more even smile, put off for years.
Gums, bone, crowns: what changes for adults?
Gums first. In adults, gum disease (periodontitis) can itself make teeth flare out, spread apart or drift. Even at an advanced stage, moving the teeth is one of the possible treatments, once gum treatment is complete and with frequent re-evaluation. So a scale and clean, and gum treatment if needed, come before the trays.
Bone. An X-ray shows the height of bone around each tooth. It helps decide what it is reasonable to move, and how far.
Teeth already treated. A crowned tooth moves like the others, since it is the root that moves. An implant stays put: it is fused with the bone, and the plan is built around it. A planned crown or veneer is often made after the teeth are aligned.
Missing teeth. When a gap has been left unfilled for years, the neighbouring teeth have often tipped into it, and the opposing tooth may have drifted towards it. Aligners can straighten these teeth to reopen a proper space before a dental implant or a bridge, or instead close a small gap.
Do clear aligners fit an adult working life?
Being able to take them out suits many adults: a restaurant meal, an important meeting, a photo. That freedom has a flip side: the trays move teeth only while they are in, usually 20 to 22 hours a day. What takes the most effort day to day:
- meals and coffees through the day: each time, take the trays out, brush your teeth, then put the trays back in;
- work trips, where the case or the next tray is easy to forget;
- the first days of each tray, with pressure on the teeth and sometimes slightly changed speech.
How long does aligner treatment take at 40?
The length depends mostly on what needs correcting. Closing a small gap or realigning two front teeth takes a few months; severe crowding or a bite problem takes more than a year. When the only aim is to prepare for a crown or veneer, alignment can be limited to a few teeth and take less time.
Three things often make treatment longer, at any age: trays worn less than planned, finishing trays when the teeth have not followed the plan, and dental work needed along the way.
Will you need a retainer after 40?
Yes, as at any age. Without retention, teeth tend to move back towards where they started, and that applies after aligners too.
The choice between a bonded wire and a retainer tray, and how often to wear it, are explained in the guide to retainers. The full course of treatment is on the clear aligners page.