Most people wear braces for about 20 to 25 months, though treatment can range from 14 months for mild cases to 33 months or more for complex ones. The single biggest factor is how much correction your teeth actually need, but your age, the type of braces, and how well you follow your orthodontist’s instructions all play a role.
The Average Timeline
A large systematic review of orthodontic studies found that the mean treatment time with fixed braces is 19.9 months. But that average masks a wide spread. When cases were evaluated under the standards of the American Board of Orthodontics, the mean for a single phase of treatment climbed to 24.6 months. In practice, most people should expect somewhere between a year and a half and two and a half years.
That window exists because no two mouths start in the same place. Cases rated as more complex by orthodontic scoring systems averaged 30 months, while less complex cases averaged 22 months. An eight-month gap is significant when you’re the one wearing brackets.
How Your Specific Problem Affects the Timeline
The type of issue being corrected is the strongest predictor of how long you’ll be in braces. Here’s what the timelines tend to look like for common problems:
- Mild crowding: Sometimes as short as 9 to 12 months, especially in younger patients whose teeth still have room to shift easily.
- Moderate crowding or spacing: Typically 20 to 26 months. Closing gaps between teeth, for example, averaged about 24 months in documented cases.
- Open bite: Often around 28 months, partly because these cases may require additional appliances to retrain tongue posture.
- Underbite: Around 30 months for adults, sometimes requiring coordination with jaw surgery.
- Severe overbite with jaw surgery: Generally 18 to 36 months depending on how much the upper and lower jaws need to be repositioned.
Cases that require tooth extractions also take longer. Without extractions, the average treatment time is about 22 months. With two premolars removed, that rises to 25 months. With four extractions, expect roughly 26 months. The extra time comes from closing the gaps left behind. Bite problems where the upper teeth sit too far forward relative to the lower teeth (a Class II bite) add another 5 to 7 months compared to a straightforward alignment case.
What’s Actually Happening Inside Your Jaw
Braces don’t just shove teeth into new positions. They trigger a biological process called bone remodeling. When a bracket and wire push a tooth in one direction, the ligament surrounding the tooth root gets compressed on one side and stretched on the other. Your body responds by dissolving bone in the path of movement and building new bone in the space left behind. This cycle of breaking down and rebuilding is what makes orthodontic movement permanent, but it also sets a speed limit. Push too fast and you risk damaging the roots or the surrounding tissue. That’s why even the most advanced braces can’t cut timelines in half.
Adults vs. Teenagers
Many adults assume their treatment will take significantly longer than a teenager’s. The research tells a more nuanced story. A meta-analysis of 11 studies covering over 4,300 patients found no significant difference in overall treatment duration between adults and adolescents. The average gap was less than one month.
There is one notable exception: teeth that are severely displaced, such as a canine tooth trapped up in the palate, take about 4 months longer to move into position in adults compared to teenagers. But for routine crowding, spacing, and bite correction, adults and teens finish on similar schedules.
Clear Aligners vs. Traditional Braces
Clear aligners like Invisalign tend to finish faster than traditional metal braces. In a comparative study, Invisalign averaged 18 months of treatment compared to 24 months for conventional braces. That’s a roughly 30% reduction in time. Other research has found similar numbers, with aligners shortening treatment by about 5 to 6 months on average.
The tradeoff is worth understanding. Aligners had a slightly higher rate of relapse (12% vs. 10% for traditional braces), though that difference wasn’t statistically significant. Both methods achieved effective corrections in about 88 to 90% of cases. Aligners also depend heavily on compliance: if you don’t wear them for the recommended 20 to 22 hours a day, the timeline stretches. And for severe or complex bite problems, traditional braces may still be the more reliable option.
What Can Add Months to Your Treatment
Your own behavior has a surprisingly measurable impact on how long you’ll wear braces. Researchers have quantified the cost of common setbacks:
- Each missed appointment adds about 1 month to treatment.
- Not wearing elastics (rubber bands) as directed adds about 1.4 months.
- Poor oral hygiene adds roughly 0.67 months (about 3 weeks) per incident, because inflamed gums slow tooth movement and may require pausing treatment.
- Each broken bracket that needs rebonding adds about 0.3 to 0.6 months.
These numbers add up quickly. A patient who misses two appointments, breaks a couple of brackets, and forgets to wear their rubber bands consistently could easily add 4 to 6 months to what would otherwise be a standard timeline. Eating hard or sticky foods is the most common cause of bracket breakage, so avoiding things like popcorn kernels, hard candy, and caramel is one of the simplest ways to stay on schedule.
Your orthodontist’s experience level also matters. Studies consistently show that more experienced clinicians complete treatment faster, likely because they make more precise adjustments at each visit and anticipate problems earlier.
Methods That Speed Things Up
Several techniques exist to accelerate tooth movement. Vibration devices, which you bite down on for about 20 minutes a day, have shown roughly a 30% reduction in treatment time in some studies. A more invasive option involves making tiny perforations in the bone near the teeth being moved (a procedure done under local anesthesia), which stimulates faster bone remodeling. This approach has shown 60 to 70% reductions in treatment time in clinical reports, though it’s not as widely offered and involves a minor surgical step.
These methods aren’t standard everywhere, and results vary. If your timeline is a major concern, it’s worth asking whether your orthodontist offers any acceleration options and whether your case is a good fit for them.
What Happens After Braces Come Off
The day your braces are removed isn’t the finish line. Your teeth will want to drift back toward their original positions, especially in the first few months. To prevent this, you’ll wear a retainer full-time (about 22 hours a day) for 3 to 6 months, sometimes up to 9 months. After that, most people transition to wearing their retainer only at night.
The nighttime phase lasts at least a year, but the reality is that retention is a long-term commitment. Adolescents may need retainers for about ten years. Adults often wear them indefinitely, at least a few nights a week. Skipping retainer wear is the single most common reason people end up needing a second round of orthodontic treatment years later.