Invisalign corrects mild to moderate underbites by gradually repositioning the lower teeth backward and the upper teeth forward using a series of custom-made clear aligners. Each set of aligners applies precise pressure to shift specific teeth by small increments, and you swap to a new set roughly every week. Most cases see noticeable improvement within 12 to 18 months, though mild underbites can resolve in as few as 6 months.
Dental vs. Skeletal Underbites
Not all underbites are the same, and the distinction matters because it determines whether Invisalign alone can help. A dental underbite means the lower teeth angle forward or the upper teeth angle backward, but the jaw bones themselves are properly sized and positioned. Invisalign works well here because the fix involves moving teeth, which is exactly what aligners do.
A skeletal underbite is a different problem. It means the lower jaw is physically too large, the upper jaw is too small, or both. When the root cause is a significant size mismatch between the jaws, no amount of tooth movement will fully correct the bite. Severe skeletal underbites require jaw surgery. In those cases, Invisalign can still play a supporting role (more on that below), but it can’t do the job on its own.
Your orthodontist will determine which type you have using X-rays and a clinical exam. Many underbites fall somewhere in between, with both a dental and a mild skeletal component. These borderline cases are where the treatment plan gets nuanced, and where an experienced provider makes the biggest difference.
How the Aligners Move Your Teeth
Each aligner tray is slightly different from the last, programmed to push certain teeth a fraction of a millimeter in a specific direction. For underbite correction, the aligners typically work on two fronts at once: tipping the lower front teeth back toward the tongue and bringing the upper front teeth forward. Over dozens of trays, these small shifts add up until the upper teeth sit in front of the lower teeth the way they should.
In some cases, your orthodontist will bond small tooth-colored bumps called attachments to certain teeth. These give the aligner something to grip, allowing it to apply more complex forces like rotating a tooth or pulling it down into position. For underbite patients, attachments on the upper front teeth are common because they help the aligner push those teeth forward more effectively.
Invisalign also uses a feature called precision wings for cases that involve the jaw position itself. These are small wing-shaped projections built into the upper and lower aligners that interlock when you close your mouth, gently guiding the lower jaw into a more retruded position over time. A clinical study from the manufacturer found that 94% of patients kept their aligners properly seated with precision wings engaged, suggesting the mechanism stays functional during normal daily wear. This feature is primarily designed for cases where the lower jaw sits too far forward, and it works by encouraging gradual repositioning while simultaneously moving teeth.
Elastics and Additional Tools
For many underbite cases, aligners alone aren’t enough to generate the right forces. Your orthodontist may have you wear small rubber bands (elastics) that hook from your upper aligners to your lower aligners. These elastics pull the lower teeth and jaw backward while pulling the upper teeth forward, adding a force vector that the plastic trays can’t produce on their own.
You’ll typically wear elastics for a portion of your treatment, not the entire duration. They attach to small hooks or buttons bonded to your teeth or cut into the aligner itself. They need to be worn consistently, usually whenever your aligners are in, to be effective.
How Long Treatment Takes
Mild underbites, where the lower teeth barely overlap the uppers, often resolve in 6 to 12 months. Moderate cases that require more significant tooth movement typically take 12 to 18 months. Complex cases involving a combination of crowding, crossbite, and underbite can stretch beyond 18 months, especially if refinement trays are needed at the end to fine-tune the result.
These timelines assume you’re wearing your aligners 20 to 22 hours per day, removing them only to eat, drink anything other than water, and brush your teeth. A randomized clinical trial published in The Angle Orthodontist confirmed that following this wear protocol is directly tied to how effectively teeth move with each tray. Wearing aligners fewer hours consistently leads to teeth not tracking properly, which means additional trays and a longer treatment.
How Invisalign Compares to Braces
Traditional braces remain the gold standard for complex bite corrections, but Invisalign has closed the gap significantly. A comparative analysis published in the Journal of Pharmacy & Bioallied Sciences found that Invisalign achieved successful malocclusion correction in 88% of cases, compared to 90% for conventional braces. The relapse rate was slightly higher with Invisalign (12% vs. 10%), but the overall difference was modest.
Where braces still have an edge is in controlling root position. Aligners are excellent at tipping teeth (angling the visible crown), but they’re less precise at bodily moving an entire tooth, root and all, through bone. For underbites that require significant root movement or vertical repositioning of teeth, braces may deliver a more predictable result. For the majority of mild to moderate dental underbites, though, Invisalign produces comparable outcomes with the added convenience of being removable and nearly invisible.
Severe Underbites: Aligners Plus Surgery
When the underbite stems from a jaw size discrepancy that’s too large for tooth movement to compensate, orthognathic (jaw) surgery becomes part of the plan. Traditionally, patients undergoing jaw surgery wore metal braces before and after the procedure. But Invisalign is now being used in that role as well.
In a documented case of a 19-year-old with a skeletal underbite and crossbite, the entire orthodontic treatment, both before and after surgery, was completed with Invisalign rather than braces. The surgical phase involved repositioning both the upper and lower jaw bones, while mini-screws held stabilizing splints in place during healing (a role normally filled by brackets and wires). The case demonstrated that clear aligners can effectively prepare the teeth for surgery and refine the bite afterward, giving patients a metal-free option even for surgical corrections.
This approach isn’t available everywhere yet, and not every surgeon is set up for it. But it’s expanding as more orthodontists and oral surgeons gain experience coordinating aligner-based surgical plans.
What Happens After Treatment
Once your underbite is corrected, retention is critical. Teeth have a strong tendency to drift back toward their original positions, especially in the first year after treatment. You’ll wear a retainer, typically a clear tray similar to your aligners, full-time for several months and then nightly long-term. Some orthodontists also bond a thin wire behind the lower front teeth as a permanent retainer to prevent them from shifting forward again. Skipping retainer wear is the single most common reason underbite corrections relapse.