Fixing an underbite as an adult is absolutely possible, though the right approach depends on whether the problem is in your teeth, your jaw, or both. Mild underbites can sometimes be corrected with braces or clear aligners alone, while moderate to severe cases often require jaw surgery combined with orthodontics. Understanding what’s driving your underbite is the first step toward choosing the right fix.
What’s Actually Causing Your Underbite
Not all underbites are the same, and the distinction matters because it determines which treatments will work. There are three types, and each one has different implications for correction.
A dental underbite means your jaw bones are properly aligned, but your teeth are angled or positioned incorrectly. Your lower front teeth tilt forward, your upper teeth tilt backward, or both. This is the easiest type to fix because the underlying structure is fine.
A skeletal underbite involves a true size or position mismatch between your upper and lower jaws. Either your lower jaw grew too far forward, your upper jaw didn’t grow enough, or some combination of the two. Genetics play a major role here. Studies of human inheritance consistently show that mandibular growth is heavily influenced by heredity, which is why underbites often run in families. Environmental factors can also contribute: chronic mouth breathing, enlarged tonsils, hormonal imbalances, and even long-term postural habits that shift the jaw’s resting position.
There’s also a pseudo underbite, where the jaw bones are actually normal in size and position, but a premature contact point between certain teeth forces your lower jaw to slide forward when you bite down. This can look and feel like a real underbite, but since the skeleton is fine, treatment is often simpler than it first appears.
Braces and Aligners for Milder Cases
If your underbite is dental rather than skeletal, orthodontics alone can often correct it. Braces or clear aligners reposition the teeth within the jaw to create a proper bite. For adults with a mild skeletal underbite, orthodontists sometimes use a strategy called “camouflage treatment.” The goal is to shift the teeth enough to compensate for the jaw discrepancy, giving you an acceptable bite and improved facial appearance without surgery. This typically involves tilting the upper front teeth forward and the lower front teeth backward. In some cases, premolar teeth are extracted to create space for that repositioning.
Camouflage works best when the skeletal mismatch is small. If the discrepancy is moderate or large, moving teeth alone can’t fully compensate, and forcing the issue can leave you with teeth at unstable angles that are prone to relapse. Your orthodontist will use X-rays and bite analysis to determine whether your case falls within the range where orthodontics alone is realistic.
Treatment time for orthodontic-only correction varies, but most adult cases take 18 to 30 months depending on the severity and how well the teeth respond.
Jaw Surgery for Moderate to Severe Underbites
When the underbite stems from a significant skeletal mismatch, orthodontics alone won’t be enough. Orthognathic surgery (jaw surgery) physically repositions one or both jaws to correct the alignment. For underbites, this usually means moving the lower jaw backward, the upper jaw forward, or both. Some cases also require vertical or side-to-side adjustments.
The process isn’t just the surgery itself. It’s a two- to three-year commitment that combines orthodontics and surgery. Typically, you’ll wear braces for several months before surgery to align the teeth within each jaw. Then the surgical procedure repositions the bones. Afterward, you continue with braces for additional months to fine-tune the bite. Some newer protocols allow surgery first, followed by all the orthodontic work, which can shorten the overall timeline slightly.
Surgery is performed under general anesthesia, and all incisions are made inside the mouth, so there are no visible scars on the face. The bones are secured in their new positions with small titanium plates and screws that stay in permanently.
What Recovery From Jaw Surgery Looks Like
The first two weeks after surgery are the most restrictive. Your jaw will be swollen, and you’ll be on a fully liquid diet: everything blended smooth enough to sip or take through a syringe. Plan on five or six small liquid meals a day, and drink plenty of fluids. Soups, smoothies, protein shakes, and pureed foods become your staples.
Between weeks two and four, you’ll gradually transition to soft foods. Think scrambled eggs, mashed vegetables, pasta, minced meat, tuna with mayonnaise, and soft fruit. You can start using a small fork again and drink from a normal cup. Over the following four to six weeks, you’ll work your way back to your regular diet as the bones heal and your jaw strength returns.
Most people return to desk work or light activity within two to three weeks. Strenuous exercise and contact sports are typically off limits for six to eight weeks. Numbness in the lower lip and chin is common after lower jaw surgery and can take several months to fully resolve, though for most people it does.
Veneers and Cosmetic Options
For very mild underbites where the main concern is appearance rather than function, porcelain veneers can mask the look of misaligned teeth. Veneers make the teeth appear straighter and can close small gaps, creating the illusion of a better bite. But they come with a critical limitation: veneers cannot change the position of your jaw. They’re a cosmetic overlay, not a structural fix.
If your underbite is moderate or severe, veneers are actually a bad idea. The abnormal bite forces put extra stress on the porcelain, increasing the risk of chipping or breaking. Veneers work best as a finishing touch after orthodontic or surgical correction, or as a standalone option only when the underbite is barely noticeable and primarily a cosmetic concern.
What Happens If You Don’t Fix It
A misaligned bite is one of the recognized causes of temporomandibular joint disorders (TMD). Over time, the uneven forces created by an underbite can lead to chronic jaw pain, clicking or locking of the jaw joint, and headaches. Your teeth also wear unevenly. The front teeth in an underbite don’t meet the way they’re designed to, which concentrates chewing forces on a smaller number of teeth and accelerates enamel breakdown. Long-term complications include chewing problems, tooth damage from grinding, and ongoing pain that becomes harder to manage the longer it goes untreated.
Underbites don’t improve on their own in adults because jaw growth is complete. If anything, the bite may gradually worsen as teeth shift with age. That doesn’t mean every underbite needs aggressive treatment, but it does mean the “wait and see” approach that works for children isn’t an option.
Cost and Insurance Coverage
The cost of correcting an underbite varies widely depending on the treatment path. Orthodontics alone (braces or aligners) typically runs between $3,000 and $7,000 for adults. Jaw surgery is substantially more expensive because it includes the surgeon’s fee, hospital costs, anesthesia, medications, and pre-surgical imaging.
The good news is that orthognathic surgery is often covered by medical insurance when a functional problem can be documented. If your underbite causes measurable issues like a severe bite discrepancy or obstructive sleep apnea, insurance may pay for the surgical portion. The key is demonstrating medical necessity rather than purely cosmetic motivation. Your orthodontist and oral surgeon typically work together to build the case for insurance approval, including diagnostic records showing the functional impairment. Check your specific plan for exclusions related to jaw surgery, as some policies carve it out regardless of medical necessity.
Orthodontic costs are more commonly covered by dental insurance, though adult orthodontic benefits tend to have lower lifetime maximums than those for children. Many orthodontic offices offer payment plans that spread the cost over the course of treatment.