Neither braces nor Invisalign is consistently faster. Study results actually conflict with each other, with some finding aligners finish months sooner and others finding braces come out ahead. The real answer depends on what kind of tooth movement you need, how disciplined you are with wear time, and how your orthodontist plans your case.
What the Studies Actually Show
If you were hoping for a clean winner, the research is frustratingly split. A 2020 study comparing aligners and braces in teenagers with mild crowding found aligner patients finished in about 17 months on average, while braces patients took roughly 23 months. That’s a six-month difference favoring Invisalign. But a 2021 study found the opposite: braces patients finished about five months earlier than aligner patients. And a 2024 review concluded there were no significant differences in treatment duration between the two.
The contradiction makes more sense when you look at the details. These studies examined different patient populations with different levels of complexity. When the cases are mild, aligners tend to be efficient. When cases get more involved, braces often catch up or pull ahead. The type of problem being corrected matters far more than the tool being used to correct it.
Where Braces Are Faster
Braces have a mechanical advantage for certain movements. Brackets bonded to each tooth give the orthodontist direct, multi-directional control over where force is applied. That makes a real difference for rotating teeth, pulling teeth downward or pushing them upward (vertical movements), correcting significant bite problems like deep bites or crossbites, and closing spaces after extractions.
These are the movements where aligners tend to stall. A plastic tray can push teeth sideways and tip them into new positions effectively, but it struggles to grip a round tooth and spin it into the correct rotation. When an aligner can’t fully execute a planned movement, the orthodontist has to order additional sets of trays, called refinements. Each round of refinements can add weeks or months to treatment. For someone with severe crowding, a significant overbite, or teeth that need a lot of rotation, braces often get the job done in fewer overall months because they don’t hit these bottlenecks.
Where Invisalign Is Faster
For mild to moderate crowding, minor spacing issues, and straightforward alignment cases, Invisalign can be genuinely quicker. The 2020 study that found a six-month advantage for aligners specifically looked at teenagers with mild problems. In these cases, the digital treatment plan maps out every stage from the start, and the trays move teeth in a predictable sequence without the adjustment visits that braces require.
Invisalign also has express treatment options designed for minor corrections, with timelines as short as three to six months. Braces rarely offer that kind of abbreviated schedule because the mechanics of wire changes and bracket adjustments have a built-in minimum pace. If your teeth need only small shifts, aligners can be a noticeably faster path.
Typical Timelines for Both
For a case of moderate complexity, you can expect braces to take roughly 18 to 24 months. Invisalign falls in a similar range, typically 12 to 24 months, with the lower end reserved for simpler cases. The overlap is significant. Most orthodontists will tell you that for the average patient, the two options finish within a few months of each other.
What pushes either option toward the longer end of that range is the same set of factors: how far your teeth need to move, whether your bite needs correction, and whether any teeth are impacted or severely out of position. Interestingly, one older study from the American Journal of Orthodontics found that the rated severity of a malocclusion didn’t actually correlate with how long treatment took. The implication is that treatment planning and patient cooperation may matter more than how crooked your teeth look at the start.
The Compliance Factor
This is the variable that doesn’t show up in clinical studies but dominates real-world outcomes. Braces work 24 hours a day because they’re glued to your teeth. You can’t take them out, forget about them, or leave them on your nightstand. Invisalign only works if you wear the trays 20 to 22 hours per day. Every hour below that threshold slows your progress.
Studies consistently show that patients overestimate how much they wear their aligners. If you’re realistically the kind of person who will remove your trays for meals and then forget to put them back in for a few hours, that lost time accumulates. A treatment plan designed for 14 months can stretch to 18 or 20 months simply because the trays weren’t in your mouth enough. For teenagers especially, this is a common reason Invisalign ends up taking longer than projected, even when the case itself is straightforward.
Braces don’t have this problem. They’re always working. The tradeoff is that you have no flexibility around eating, cleaning, or appearance, but from a pure speed standpoint, the “always on” nature of braces removes a major source of delay.
What Actually Determines Your Timeline
Rather than choosing based on which method is generically “faster,” it helps to think about the specific factors that will shape your treatment length.
- Type of movement needed: Simple tipping and alignment favors aligners. Rotation, vertical correction, and extraction-space closure favors braces.
- Starting complexity: Mild cases can finish in under a year with either method. Complex cases involving bite correction typically take 18 months or longer regardless of approach.
- Your wear compliance: If you’re confident you’ll keep aligners in for 22 hours a day, the projected timeline is realistic. If not, add months.
- Refinements: Many Invisalign patients need one or two rounds of additional trays after their initial set. Each round typically adds four to eight weeks.
- Appointment consistency: Missed or delayed adjustment appointments slow braces down. Falling behind on tray changes slows Invisalign.
Your orthodontist can give you a case-specific estimate after imaging and examination. That projection will be far more accurate than any general comparison, because it accounts for the exact movements your teeth need. If speed is your top priority, ask directly: “For my specific case, which option gets me done sooner?” The answer may surprise you in either direction.