Invisalign typically takes about 18 months to complete, while traditional braces average around 24 months. That six-month difference holds up in clinical comparisons, but your actual timeline depends on the complexity of your case, how consistently you follow your treatment plan, and whether you need additional refinement at the end.
Average Treatment Times
A comparative study published in the Journal of Pharmacy & Bioallied Sciences found that conventional braces took an average of 24 months, while Invisalign averaged 18 months. The difference was statistically significant, meaning it wasn’t just random variation between patients. Individual cases ranged roughly four months above or below those averages for braces and about three months for Invisalign, so a straightforward braces case might wrap up in 20 months while a more involved Invisalign case could stretch to 21.
These numbers represent moderate orthodontic cases. If you only need minor crowding or spacing fixed, either option could finish in as few as 6 to 12 months. Severe bite corrections or significant tooth movement can push braces past 30 months and may not be feasible with aligners at all.
Why Invisalign Can Be Faster
Clear aligners work by applying pressure through a series of custom trays, each designed to move teeth a precise, small amount before you switch to the next one. You typically wear each tray for one to two weeks, then move on. This system is digitally planned from the start, which means all of your trays are manufactured in advance based on a mapped-out sequence of movements.
Braces, by contrast, rely on periodic wire adjustments where your orthodontist manually increases tension. Each adjustment moves teeth a certain distance before the next visit. This process works extremely well for complex movements, but the manual adjustment cycle can add time compared to the pre-programmed aligner approach. That said, braces maintain constant force 24 hours a day without any effort on your part, which brings us to the biggest variable in aligner treatment.
Compliance Changes Everything With Invisalign
Invisalign’s faster average assumes you wear your aligners 20 to 22 hours every single day. That leaves just two to four hours for eating, drinking anything other than water, and brushing your teeth. If you consistently fall short of that window, your teeth simply don’t get enough sustained pressure to move on schedule. The result: you end up wearing each tray longer than planned, and your total treatment stretches well beyond that 18-month average.
Braces don’t have this problem. Once they’re bonded to your teeth, they’re working around the clock whether you think about them or not. For people who know they’ll struggle with the discipline of keeping aligners in, braces can actually end up being the faster option in practice, even if they’re slower on paper.
The Refinement Phase With Aligners
One detail that often surprises Invisalign patients is the refinement stage. After you finish your initial set of trays, your orthodontist evaluates whether your teeth have landed exactly where they should be. If small adjustments are still needed, you’ll get a new set of refinement aligners. This adds one to three months to your overall treatment time, depending on how much fine-tuning is required.
Not every patient needs refinement trays, but they’re common enough that you should factor them into your expectations. When an orthodontist quotes you a treatment time of 18 months, that estimate may or may not include the refinement phase. Ask specifically whether the timeline accounts for refinements so you’re not caught off guard.
Office Visits and Day-to-Day Convenience
Both options require regular orthodontist appointments, but the frequency and purpose differ. With braces, you’ll go in for wire adjustments. With aligners, check-ups are mainly to confirm your teeth are tracking correctly. In either case, modern orthodontics typically spaces appointments 6 to 10 weeks apart, according to the American Association of Orthodontists. Aligner patients often receive multiple trays at once and swap them on their own at home, which can mean fewer total office visits over the course of treatment.
For braces, each visit involves tightening or changing the archwire, which usually causes soreness for a day or two afterward. Aligner switches also create pressure when you put in a new tray, but many patients find the discomfort milder since each tray makes a smaller incremental change.
Accelerated Treatment Options
If you’re looking to speed things up regardless of which system you choose, some orthodontists offer acceleration techniques. Low-level laser therapy, which uses light energy to stimulate bone remodeling around teeth, has been shown to reduce treatment time by 20 to 50 percent in clinical studies. A technique called flapless corticotomy, a minor procedure that stimulates the bone around your teeth, produced similar reductions of 43 to 50 percent. However, vibration devices marketed to speed up tooth movement have not shown meaningful results in systematic reviews.
These options aren’t available everywhere and they add cost, but if timeline is your top priority, they’re worth asking about.
What Happens After Treatment Ends
Regardless of whether you finish in 18 months or 24, the retention phase afterward is the same for both braces and Invisalign. Your teeth will want to drift back toward their original positions, especially in the first year. The standard protocol looks like this:
- First 3 to 6 months: Full-time retainer wear, 20 to 22 hours per day, removing only to eat and brush.
- Months 6 to 12: Transition to nighttime-only wear, roughly 8 to 10 hours while sleeping.
- After year one: Continue wearing your retainer at least a few nights per week.
Many orthodontists now recommend nightly retainer wear indefinitely. This applies equally whether your teeth were straightened with braces or aligners. Skipping retainer wear is the most common reason people lose the results they spent months achieving.
Choosing Based on Your Situation
The six-month average difference between Invisalign and braces matters, but it’s not the whole picture. Invisalign’s shorter timeline depends on near-perfect compliance. If your case involves complex bite issues, significant rotation, or large vertical movements, braces may be more effective and could finish sooner than aligners would for that same level of difficulty.
For mild to moderate crowding or spacing, Invisalign’s speed advantage tends to hold. For severe or complicated cases, braces remain the more predictable option. Your orthodontist can give you a case-specific estimate after imaging, but as a general rule: expect roughly 18 months for aligners and 24 months for braces, plus one to three months of refinement for aligners and the retention phase for both.