Almost everyone’s upper front teeth cover part of the lower ones, so an overbite on its own is normal. It becomes a problem when the overlap is deep enough to injure the gums, wear the teeth, or strain the jaw. How bad yours is depends more on what it is doing to your mouth than on how it looks in the mirror. A deep overbite is usually driven by the shape of the jaw and how the teeth line up along it, which is why the fix ranges from aligners to, rarely, jaw surgery.1PubMed. Deep overbite malocclusion: analysis of the underlying components
How to Judge Your Overbite at Home
Dentists judge an overbite by how much of the lower front teeth’s height is hidden by the upper front teeth when you bite together. In a typical bite, about 2 to 3 mm is covered, roughly a quarter to a third of the lower teeth. When half or more is covered, dentists call it a deep bite, and 50% overlap is the line long-term studies use.2PubMed. Stability and relapse after orthodontic treatment of deep bite cases-a long-term follow-up study
Many people say overbite when they mean the upper teeth sticking out in front. Dentists call that overjet, and it is a separate measurement. You can have one without the other, and a deep bite can even hide behind upper teeth that tip backward.3PubMed. Temporomandibular disorders and psychological status in adult patients with a deep bite
A phone photo is a reasonable first check. Close-up photos of the front teeth matched an in-person dental exam for overbite in a remote-dentistry comparison.4Journal of updates in Pediatric Dentistry. Comparative evaluation of malocclusions using digital intraoral photography and conventional examination methods: A tele dentistry approach in orthodontics The same photos judged how far teeth stick out much less reliably, about 8 times in 10.5Journal of updates in Pediatric Dentistry. Comparative evaluation of malocclusions using digital intraoral photography and conventional examination methods: A tele dentistry approach in orthodontics So a photo can tell you roughly how deep your bite is, but a dentist still needs to measure the rest.
To take a useful photo, bite down naturally on your back teeth without pushing your jaw forward. Pull your lips back with your fingers and photograph straight on in good light. Add a side view that shows how far the upper teeth sit ahead. Then estimate what fraction of the lower teeth is hidden behind the upper ones.
In the mirror, a typical bite lets you still see most of each lower tooth, with only the top edge tucked behind the upper teeth. If you see only a thin strip of the lower teeth, or none, the overlap is likely well past the typical range.
A few mistakes skew the result. Pushing the jaw forward makes the bite look shallower than it is. Judging from a smile shows only the upper teeth, not the overlap. Crowded, tilted, or uneven lower teeth can make the overlap look bigger in some spots and smaller in others, so look across all four lower front teeth rather than one. Worn or chipped lower teeth can make the overlap look deceptively small, because the measure depends on tooth height. A dentist can confirm the real figure with a ruler or models of your teeth, so treat your own estimate as a starting point.
Signs Your Overbite Is Causing Damage
Gum injury is the clearest warning sign. A deep bite can let the lower front teeth hit the gum behind the upper teeth, and in some cases the upper teeth press on the gum in front of the lower ones.6PubMed. Periodontal lesions associated with deep traumatic overbite That repeated contact can injure the gum surface and trap food, which can lead to unusual gum and bone damage.7PubMed. Periodontal lesions associated with deep traumatic overbite The damage is more likely when brushing and flossing are poor.8PubMed. Periodontal lesions associated with deep traumatic overbite
In the mirror, look for red or white indentations on the roof of your mouth just behind the upper front teeth. Tenderness or bleeding there when you eat crunchy food is another clue, as is gum receding on the front of the lower teeth. Food that keeps getting stuck in the same spot also points to the area.
Front teeth can wear too. The way the front teeth overlap guides how the jaw slides, which protects the back teeth from wear but puts more of the wear on the front teeth.9IntechOpen. Developmental Dental Defects and Tooth Wear: Pathological Processes Relationship Front teeth that look shorter, chipped, or flat along the edges can be a sign the bite is grinding them down.
Some flattening of tooth edges is expected over many years, so what matters is wear that looks out of proportion to your age. Wear from bite contact tends to show as shiny flat patches on the edges of the upper and lower front teeth that match each other when you close. Wear that is changing quickly, or teeth that feel sensitive where the enamel is thinning, deserve a dental opinion sooner. Jaw symptoms are the third group, covered in the next section.10PubMed. Temporomandibular disorders and psychological status in adult patients with a deep bite
One sign is a reason to get checked, but it doesn’t prove the bite is the cause, since other things can also inflame gums or wear teeth. The more of these signs you have in the same area, the more likely the bite is involved.
Can an Overbite Cause Jaw Pain and Headaches
Adults with a deep bite have headaches, muscle pain, and slipped joint discs more often than people with a normal bite.11PubMed. Temporomandibular disorders and psychological status in adult patients with a deep bite The risk looks highest when the upper front teeth tilt backward toward the tongue.12PubMed. Temporomandibular disorders and psychological status in adult patients with a deep bite Scans show measurable changes in the jaw joint in severe deep bites, but not mild ones.13PubMed. Three-dimensional assessment of temporomandibular joint in skeletal Class I malocclusion with variable degrees of overbite and overjet
You may see the term TMD on a dental record. It is short for temporomandibular disorder, meaning problems in the jaw joint by the ear. It covers joint pain, clicking, locking, and sore chewing muscles. Many cases have causes beyond the bite, such as clenching or stress.
Among people with both jaw joint problems and a deep bite, about half had trouble opening wide and about 4 in 10 had clicking or popping.14PubMed Central. A novel posterior occlusal splint improves symptoms and prognosis of coexisting temporomandibular disorders and deep bite: a retrospective study About 4 in 10 felt pain when moving the jaw.15PubMed Central. A novel posterior occlusal splint improves symptoms and prognosis of coexisting temporomandibular disorders and deep bite: a retrospective study These symptoms often come from the joint’s cushioning disc sitting out of place, which can wear the joint over time if untreated.16PubMed Central. A novel posterior occlusal splint improves symptoms and prognosis of coexisting temporomandibular disorders and deep bite: a retrospective study Treatment aims to open the bite slightly and remove the front-tooth contact that forces the jaw back.17PubMed Central. A novel posterior occlusal splint improves symptoms and prognosis of coexisting temporomandibular disorders and deep bite: a retrospective study
Backward-tipping upper front teeth matter because they can block the lower jaw from sliding forward freely. That can leave the jaw sitting further back than is comfortable, which loads the joint. Treatments that free up the front teeth let the jaw settle into a more natural position.
Many people with a deep bite never develop symptoms. Clenching, grinding, stress, and past jaw injuries also matter and often overlap with the bite, which is why a dentist looks at the whole picture before blaming the overlap.
Some symptoms need a prompt visit: a jaw that locks open or closed, pain that stops you chewing normally, mouth opening that is getting narrower over weeks, or clicking that newly comes with pain.
Why Some People Have a Deep Bite
The most common contributor is a lower row of teeth that dips deeply in the middle, so the front teeth sit too high. It is found in nearly 8 in 10 deep bites.18PubMed. Deep overbite malocclusion: analysis of the underlying components Short lower back teeth add to it.19PubMed Central. Skeletal and Dentoalveolar Features in Patients with Deep Overbite Malocclusion A jaw with a squarer angle at the back and a short lower face is the most common bone-related cause, in over a third of cases.20PubMed. Deep overbite malocclusion: analysis of the underlying components So deep bites are often part of a face shape, not just tooth position.
From the side, the lower teeth normally form a gentle curve rather than a straight line. In a deep bite the curve can be exaggerated, so the middle of the arch dips and the front teeth sit too high relative to the back teeth. The upper front teeth then drop further over the lower ones when you bite.
Teeth keep moving until they meet something, so front teeth that grow too far can deepen the overlap. That is why correcting a deep bite often involves changing the height of both front and back teeth.
The cause shapes the fix. A bite from tooth curve can often be flattened with braces or aligners. A bite from jaw shape is harder to correct with teeth alone, and a short lower face is the pattern most likely to need surgery in adults.
Treatment Options From Childhood to Adulthood
In growing children, removable bite-block appliances guide the lower jaw forward and reduce both the overlap and how far the upper teeth stick out.21PubMed Central. Myofunctional Trainer versus Twin Block in Developing Class II Division I Malocclusion: A Randomized Comparative Clinical Trial They can also let the lower back teeth grow taller, which helps open a deep bite.22PubMed Central. Mini-fixed Twin Block Appliance: An Alternative to Fixed Functional Appliance in Noncompliant Class II Patients In children with sleep apnea and a set-back lower jaw, these appliances widened the airway and reduced breathing pauses.23PubMed. Effects of twin-block appliance on upper airway parameters in OSA children with class II malocclusion and mandibular retrognathia: a CBCT study
Timing matters because these appliances work while the jaw is still growing. Treatment started roughly between ages 9 and 12 relapses less, and waiting until growth ends can narrow the options. The appliance is usually worn a set number of hours a day, often including nights, and it works only as well as it is worn. It guides the lower jaw forward as the child grows rather than forcing it, and regular checkups let the orthodontist adjust it as the jaw changes.
Adults without surgery usually get braces or clear aligners, which correct a deep bite by pushing front teeth up into the gums and letting back teeth rise. Aligners are planned in stages to push specific teeth, and the staging changes which teeth move.24PubMed Central. Force changes associated with different intrusion strategies for deep-bite correction by clear aligners
Tiny screws placed in the jawbone as anchors push front teeth up about 0.5 to 0.8 mm more than standard methods.25PubMed Central. The Effects of Intrusion of Anterior Teeth by Skeletal Anchorage in Deep Bite Patients; A Systematic Review and Meta-Analysis26PubMed Central. Effectiveness of Orthodontic Mini-Screw Implants in Adult Deep Bite Patients during Incisor Intrusion: A Systematic Review That extra amount is small enough that many orthodontists don’t consider it a major difference.27PubMed Central. Effectiveness of Orthodontic Mini-Screw Implants in Adult Deep Bite Patients during Incisor Intrusion: A Systematic Review The screws are temporary posts placed in the bone beside the teeth under local numbing. They give the orthodontist a fixed point to pull against, so the front teeth can be pushed up with less effect on other teeth, and they are removed when no longer needed.
Surgery is for severe jaw-shape cases. When a deep bite comes with a short lower face, braces alone often can’t lengthen the face enough or keep the bite stable.28PubMed. Treatment of Class II deep bite by orthodontic and surgical means Combined braces and jaw surgery gives more stable, better-looking results in those cases.29PubMed. Treatment of Class II deep bite by orthodontic and surgical means Severe deep bites with missing back teeth can’t usually be fixed with crowns or dentures alone.30PubMed Central. Two middle-aged cases of deep overbite without molar support treated by orthognathic surgery
At a consultation, it helps to ask:
- Is the cause mainly tooth position or jaw shape?
- Can aligners do the job, or are braces better?
- Would anchor screws or surgery change the result?
- How long will treatment and retainer wear last?
Will It Come Back After Treatment
Years after treatment, about 1 in 10 people saw the overlap return to half or more, and the change was usually small.31PubMed. Stability and relapse after orthodontic treatment of deep bite cases-a long-term follow-up study Most of them had a fixed wire retainer behind the lower teeth and a removable upper plate.32PubMed. Stability and relapse after orthodontic treatment of deep bite cases-a long-term follow-up study
Teeth sit in bone and gum fibers that remember their old position, and these tissues need time to settle around the new one. Normal changes in the jaw and bite over the years can also slowly nudge teeth even after they are well settled.
Even with long-term retainers, some teeth shift in about 13% of measurements.33PubMed. Retention and stability–taking various treatment parameters into account Shifting was more common after treatment shorter than 3 years (19%) than longer than 4 years.34PubMed. Retention and stability–taking various treatment parameters into account Combining fixed front retainers with a removable one worn into your late twenties gives the best protection.35PubMed. Retention and stability–taking various treatment parameters into account
Fixed wires need careful flossing underneath, and removable ones are often worn nightly long term. Report a loose or broken wire quickly.
A bite that has slipped back may show up as the lower front teeth hiding more behind the upper ones than at the end of treatment. Small gaps or crowding returning in the front teeth can also signal movement. Comparing with photos from the end of treatment helps you judge.
How Fixing an Overbite Changes Your Smile and Confidence
Pushing front teeth up shows less of the upper teeth when you smile, and this change tends to stay.36PubMed Central. Does overbite reduction affect smile esthetics?37Seminars in Orthodontics. Overbite Correction and Smile Aesthetics About half of patients get a flatter smile curve, but that happens with orthodontics in general, not one method.38Seminars in Orthodontics. Overbite Correction and Smile Aesthetics So ask your orthodontist to plan how much tooth should show when you smile.
For people who showed a lot of upper tooth before, the lifted front teeth can look more balanced. For people who already showed little, it is worth discussing the plan so the result is not too subtle.
Teens with larger overbites report more impact on daily life and comfort with their teeth.39PubMed Central. The impact of overjet, overbite, and anterior crowding on oral health-related quality of life of adolescents: A cross-sectional study Children with a deeper overbite or protruding teeth are more often bullied and report lower self-esteem.40PubMed. Bullying in orthodontic patients and its relationship to malocclusion, self-esteem and oral health-related quality of life That makes confidence a legitimate reason to treat, even with no damage signs.