A deep bite is a type of misalignment where your upper front teeth overlap your lower front teeth by too much when you close your mouth. Some overlap is normal, but when the upper teeth cover more than about a third of the lower teeth, orthodontists classify it as a deep bite. In severe cases, the lower teeth may bite into the gum tissue behind the upper teeth, causing direct tissue damage.
What Causes a Deep Bite
Deep bites develop from a mix of genetic, environmental, and developmental factors. Genetics play a significant role. Researchers have identified specific genes involved in jaw development, tooth eruption, and root formation that can predispose someone to this condition. If your parents had a deep bite, you’re more likely to develop one yourself.
Childhood habits like thumb sucking, tongue thrusting, and prolonged pacifier use can also contribute. These behaviors apply repetitive pressure to the teeth and jaws during the years when those structures are still growing, gradually pushing things out of alignment. Beyond habits, a deep bite can develop when front teeth erupt too far, when back teeth don’t erupt enough, or when there’s a mismatch between the size of the upper and lower jaws. Tooth loss in the back of the mouth can worsen things too, since the remaining front teeth can drift and over-erupt without anything to stop them.
Dental vs. Skeletal Deep Bites
Not all deep bites come from the same place. The distinction matters because it determines what kind of treatment will work.
A dental deep bite is caused by the teeth themselves. The front teeth may have erupted too far, the back teeth may sit too low, or there’s an exaggerated curve along the chewing surfaces of the lower teeth. The underlying jawbones are relatively normal in size and position.
A skeletal deep bite involves the jaw structure. The most common pattern is an upward and forward rotation of the lower jaw, which compresses the lower face height and drives the front teeth into a deeper overlap. Key indicators include a reduced angle where the lower jaw meets the skull and a shorter lower face. In many people, both skeletal and dental factors are at work simultaneously, with the rotated jaw positioning the teeth in a way that deepens the overlap further.
Problems a Deep Bite Can Cause
A mild deep bite may never cause noticeable issues. But as the overlap increases, so does the potential for damage. In a “traumatic” deep bite, the lower front teeth press into the gum tissue on the roof of the mouth every time you close your jaw. Over time, this leads to gum recession, tissue irritation, and even bone loss around the upper front teeth. One study of adults treated for traumatic deep bites found that gum recession depths averaged about 2 mm before treatment, with visible increases in the exposed length of the upper front teeth.
Excessive overlap also accelerates enamel wear. The upper and lower front teeth grind against each other at steep angles, wearing down edges faster than they would in a well-aligned bite. This can shorten the teeth over the years and make them more vulnerable to chipping. Many people with deep bites also report jaw pain, clicking, or tension headaches, because the restricted movement of the lower jaw places extra stress on the jaw joints and surrounding muscles.
How Deep Bites Are Treated
Orthodontists correct deep bites through three basic strategies: pushing the front teeth up into the jawbone (intrusion), encouraging the back teeth to erupt further (extrusion), or tilting the front teeth forward (proclination). Most treatment plans combine more than one approach, chosen based on the person’s facial proportions and where the problem originates.
If someone has a short lower face, excessive curvature along the lower teeth, and their front teeth don’t show too much when they smile, the preferred approach is to bring the back teeth down. This can be done with bite plates, which are devices bonded or clipped behind the upper front teeth that create a gap between the back teeth, giving them room to erupt further. A reverse-curve archwire achieves a similar effect by applying a gentle downward force on the molars while slightly flaring the front teeth.
When the problem is the opposite, with a long lower face, a gummy smile, and front teeth that have erupted too far, intrusion is the better choice. Small titanium screws temporarily anchored in the jawbone (called miniscrews) have become one of the most effective tools for this. A systematic review comparing techniques found that miniscrew-supported intrusion produced about 2 mm of upper incisor intrusion, significantly outperforming older methods like headgear and utility arches. The screws are tiny, placed under local anesthesia, and removed once treatment is complete.
Clear Aligners for Deep Bites
Clear aligner systems like Invisalign can treat deep bites, though the approach requires specific design features. Built-in bite ramps, which are small raised platforms on the inside surface of the upper aligners, press against the lower front teeth when you bite down. These serve a dual purpose: they begin opening the bite immediately and prevent the back teeth from being forced together by unwanted pressure.
To extrude the back teeth, the aligners use attachments, small tooth-colored bumps bonded to the premolars and molars. These give the aligner material something to grip, allowing it to apply more effective pulling forces on those teeth. Newer aligner generations also incorporate pressure zones on the inner surface targeting the lower front teeth individually, delivering more controlled intrusion forces along each tooth’s natural axis. Clear aligners work best for mild to moderate deep bites. Severe cases, especially those with a significant skeletal component, typically still require traditional braces or a combined approach.
When Surgery Is Needed
Most deep bites can be managed with braces or aligners alone. Surgery enters the conversation for adults with severe skeletal discrepancies, particularly when the jaw relationship is too far off for tooth movement to compensate. In adults with a pronounced Class II jaw pattern and a deep bite, orthognathic (jaw) surgery is considered the ideal option because the jaws have stopped growing and can’t be reshaped through orthodontics alone.
The decision isn’t purely clinical, though. For borderline cases, patient priorities matter. Someone unhappy with their facial profile may opt for surgery to address both the bite and the facial proportions, while someone comfortable with their appearance might choose a “camouflage” approach, rearranging the teeth to mask the underlying skeletal issue. Factors like lifestyle, career demands, and recovery time all play into the decision.
Deep Bites in Children
The American Association of Orthodontists recommends that children have their first orthodontic evaluation no later than age 7. At this age, enough permanent teeth have come in to spot developing problems, but the jaw is still growing, which means there’s more flexibility to guide its shape.
Early treatment for a deep bite is particularly worthwhile when the lower front teeth are biting into the palate, since that tissue damage compounds over time. Intervening during the growth years can take advantage of the jaw’s natural development to help correct the overlap, potentially simplifying or shortening the treatment needed later with full braces. Early correction also avoids the social and emotional toll that visible bite problems can have on a child during school years. Not every child with a deep bite needs early treatment, but catching it early gives the orthodontist more options and, in many cases, leads to a less invasive path overall.
Keeping Results After Treatment
Deep bites have a well-documented tendency to relapse. The teeth and jaw want to drift back toward their original positions, especially in the first few years after braces come off. Retention is critical. Most patients receive a fixed retainer bonded behind the lower front teeth, which stays in place permanently or for several years, along with a removable upper retainer or bite plate to maintain the corrected overlap. Skipping retainer wear is one of the most common reasons a deep bite returns after successful treatment.