Underbite Braces: Can They Fix It, and What Does Treatment Actually Look Like?
An underbite does not fix itself. If your lower teeth sit in front of your upper teeth when you bite down, that is a skeletal and dental relationship that tends to stay — or get worse — without intervention.
The good news: braces can fix most underbites, and the earlier treatment starts, the simpler it usually is. The less obvious part is that braces for an underbite often means more than just brackets and wires. Depending on the cause and severity, treatment might include rubber bands, expanders, or in some cases, a combination of orthodontics and jaw surgery.
Dr. Patel sees underbite cases regularly at Tooth By Tooth Orthodontics in Cary. This is a straightforward guide to what underbite treatment actually involves.
What Causes an Underbite?
Underbites have two possible origins, and the treatment approach depends heavily on which one is at play.
Dental underbite: The teeth are angled incorrectly. Upper front teeth tip inward while lower front teeth tip outward — creating the appearance of an underbite even when the jaw bones themselves are in good alignment. This is more common and more straightforward to correct with braces.
Skeletal underbite: The lower jaw (mandible) is genuinely larger than the upper jaw, or the upper jaw is underdeveloped. This is a bone structure issue, not just a tooth position issue. Mild to moderate skeletal underbites can often still be managed with orthodontics, especially in children. Severe cases in adults may require jaw surgery.
In practice, most underbites Dr. Patel evaluates have a mix of both dental and skeletal components. The evaluation — including X-rays and bite analysis — determines which is driving the problem and what treatment will actually work.
Can Braces Fix an Underbite?
Yes — in many cases, braces are the primary treatment for an underbite. But the answer depends on the patient’s age and the severity of the skeletal component.
| Patient Profile | Can Braces Fix It? | Notes |
|---|---|---|
| Child (7-12), mild underbite | Yes, often with expander | Early treatment most effective |
| Teen, dental underbite | Yes, braces and rubber bands | Rubber bands reposition jaw relationship |
| Teen, moderate skeletal | Usually yes | May need functional appliance too |
| Adult, dental underbite | Yes | Braces alone often sufficient |
| Adult, severe skeletal | Partial improvement only | Jaw surgery likely needed for full correction |
Every case is different. A patient with a moderate skeletal underbite at age 10 has options that the same patient at age 25 does not, because the jaw is still growing. That is why timing matters so much.
How Underbite Treatment Works — What to Expect
When braces are used to treat an underbite, the process typically unfolds in stages.
Phase 1 (if applicable): For children whose jaws are still growing, Dr. Patel may recommend a palate expander to widen the upper jaw before braces are placed. This makes more room for upper teeth and improves the overall jaw relationship. Phase 1 treatment happens between ages 7 and 11 for most patients.
Full braces: Once all permanent teeth are in, full braces are placed. Brackets and wires work to level, align, and position teeth properly in each arch.
Rubber bands (elastics): This is the part that specifically addresses the underbite relationship. Class III rubber bands run from the upper back teeth to the lower front teeth. They apply a constant, gentle force that encourages the upper arch forward and the lower arch back. Patients wear these 20 or more hours per day for several months.
Retention: After braces come off, retainers hold the corrected position. This is non-negotiable for underbite cases, where relapse risk is higher than with simple crowding.
Total treatment time varies. Most orthodontic underbite cases run 18 to 30 months, depending on severity and patient compliance with rubber band wear.
What If Braces Alone Are Not Enough?
Some underbites — particularly severe skeletal ones in adults whose jaws have stopped growing — cannot be fully corrected with orthodontics alone. Braces can improve alignment and function, but if the jaw bones are significantly out of position, the only way to fully correct that relationship is orthognathic surgery.
Dr. Patel will always be direct about this. If a patient presents with a case that requires surgical input, he refers to an oral and maxillofacial surgeon and the two work together. Pre-surgical orthodontics positions teeth correctly within each arch first, then surgery repositions the jaws, then finishing orthodontics completes the case.
This is not the typical path for underbite treatment — but patients deserve to know it exists and when it is the right call.
Timing: When to Start Underbite Treatment
The American Association of Orthodontists recommends that children have their first orthodontic evaluation by age 7. For underbite cases, this recommendation matters more than almost any other issue.
When an underbite is caught in early childhood — ideally between ages 7 and 10 — Dr. Patel can often use Phase 1 treatment to influence jaw growth before it is complete. A palate expander worn during these years can meaningfully change the upper-to-lower jaw relationship, making Phase 2 treatment simpler and reducing the likelihood of needing surgery.
Waiting until the teen years does not make underbite correction impossible — most teens do fine with braces and rubber bands. But the window for influencing jaw growth closes. Whatever skeletal component exists at that point is what we are working with.
Adults with underbites can still see significant improvement with braces. Full correction of a severe skeletal underbite may require surgery, but many adults are surprised by how much improvement orthodontics alone can provide.
Frequently Asked Questions
How long does it take to fix an underbite with braces?
Most underbite cases treated with braces take 18 to 30 months. Cases that include Phase 1 treatment in childhood may have a shorter Phase 2 because the jaw relationship was improved early. Severity, patient age, and rubber band compliance all affect timing.
Do rubber bands hurt when correcting an underbite?
Rubber bands create pressure, not sharp pain. Most patients feel soreness for the first few days and then adjust. The key is wearing them consistently — taking them out frequently extends treatment and reduces effectiveness.
Can an underbite come back after braces?
Yes, especially in cases with a skeletal component. That is why retainer wear after braces is non-negotiable for underbite patients. Dr. Patel typically recommends long-term retainer wear for these cases.
Have questions about your child’s bite? Dr. Patel is happy to take a look — no commitment, no runaround. Book a free consultation at Tooth By Tooth Orthodontics in Cary.
Related reading: Phase I orthodontics | Overbite braces before and after results
About the Author: Dr. Nishant Patel, DDS, MS is the founder and sole orthodontist at Tooth By Tooth Orthodontics in Cary, NC. He earned his DDS from the University of Illinois at Chicago (top of his class) and his MS with orthodontic certificate from the University of Minnesota. His research has been published in the American Journal of Orthodontics and Dentofacial Orthopedics. After eight years in practice in the Chicago suburbs, he founded Tooth By Tooth in Cary with a commitment to personal, meticulous care — one doctor, one location, every visit.
