When researchers pooled the results of studies on fixed braces, the average time in treatment came out at just under 20 months. That figure hides a wide spread. Someone closing a small gap between the front teeth may be finished much sooner, while a person with a deep bite, crowding that needs extractions, or a jaw discrepancy can be in braces for close to three years.
The average comes from a systematic review by Tsichlaki and colleagues, published in the American Journal of Orthodontics and Dentofacial Orthopedics in 2016, which pooled studies carried out mostly in university clinics. Your own estimate depends on what has to change in your mouth, and it is something a dentist can give you only after an examination, X-rays and records.
Why one person finishes in months and another in three years
The biggest single factor is the amount and type of movement needed. Tipping a slightly rotated front tooth into line is a small, quick movement. Moving a whole group of teeth backwards to close an extraction space, correcting a crossbite, or reducing a large overbite involves moving roots through bone over a longer distance, and those stages simply take more months.
Bite correction is often the slow part. Many people find their teeth look straight well before treatment ends, then spend the rest of it on the way the upper and lower teeth meet. That second phase is less visible but matters for chewing, wear and long-term stability.
Teeth can only move so fast
Teeth move because the bone around the root slowly remodels: it is resorbed on the side the tooth is pushed towards and rebuilt behind it. That process has a natural pace, often described as roughly a millimetre a month, and heavier forces do not make it meaningfully quicker. They mainly increase discomfort and the risk of root shortening. Various devices and procedures claim to speed treatment up, but Cochrane reviews have found the evidence that they shorten overall treatment time to be of low certainty.
Age has some influence. Children and teenagers who are still growing can have certain bite problems guided with growth, which may make some corrections easier. Adults can still move teeth successfully, as our article on braces for adults explains, though adult treatment sometimes involves extra steps such as managing gum health or existing dental work.
Habits that keep treatment on schedule
Your part in the timeline is larger than many people expect. Elastics, if prescribed, only work when they are worn for the hours advised; wearing them half the time can add months. Every broken bracket means the tooth stops moving correctly until it is repaired, so following the advice in our guide to foods to avoid with braces pays off. Missed or postponed reviews delay wire changes. Gum inflammation from plaque can also slow progress and may need to settle before the next step.
Aligners and braces on time
For similar mild to moderate cases, clear aligners and fixed braces tend to take comparable lengths of time, because both are limited by the same biology. Studies comparing them have produced mixed findings, partly because aligners are often used for simpler cases to begin with. Aligners rely on being worn around 20 to 22 hours a day, so wear time has a direct effect on the schedule. Our comparison of braces and aligners looks at which suits which situation.
Retention has no fixed end date
The months in braces are the active phase. Afterwards, teeth tend to drift, both back towards where they started and gradually with age, so a retainer is part of the plan from the start. Many people wear a removable retainer at night in the long term, sometimes alongside a bonded wire behind the front teeth. Our guide to retainer types and wear time covers the options.
What patients ask about treatment length
Will my dentist be able to tell me exactly how long it will take?
You will get an estimated range at the planning stage. It may be revised during treatment, depending on how the teeth respond and how closely instructions are followed.
Do braces take longer on the bottom teeth or the top?
It depends on the problem rather than the arch. Both arches are usually treated together so the bite can be coordinated.
Can treatment be stopped early if I am happy with how my teeth look?
Stopping before the bite is corrected can leave the teeth less stable and more likely to move. It is worth discussing with your dentist before deciding.
For a personal estimate, start with an assessment. A dentist at Lumi Dental can examine your teeth, take a 3D scan and talk through the likely timeframe and your options. See our current offers or book with a general dentist in Melrose Park. This article is general information and not a substitute for personal dental advice.
