Short answer: A deep bite is when, with the mouth closed, the upper front teeth overlap the lower front teeth vertically more than they should. It develops for reasons such as genetic jaw structure, loss of back teeth, teeth clenching and a lower jaw that sits too far back. If left untreated, it can lead to tooth wear, gum damage and jaw joint problems. In most cases it can be corrected with braces or clear aligners.
If your lower front teeth are barely visible when you smile in the mirror, or if your lower teeth touch the roof of your mouth, this may be a sign of a deep bite. Also referred to in the medical literature as "deep overbite" or "excessive vertical overlap", a deep bite is one of the most common bite problems. Although it is often seen as a cosmetic issue, in the long term it can affect the teeth, the gums and the jaw joint. In this article we explain what a deep bite is, why it develops, what can happen if it is not treated and the current treatment options.
What is a deep bite?
A deep bite is when, with the teeth closed, the upper front teeth overlap the lower front teeth vertically more than normal. In an ideal bite, the upper incisors cover about 2–3 millimeters of the lower incisors, roughly one third of the tooth surface. When this proportion increases significantly, it is called a deep bite. In severe cases, the lower incisors become completely hidden and their tips can touch the mucosa of the palate.
A deep bite can occur on its own, or together with a Class II relationship in which the lower jaw sits too far back, or with front teeth that are tilted inward. For this reason, when planning treatment, not only the amount of vertical overlap but also the position of the jaws relative to each other and the inclination of the teeth are assessed.
Why does a deep bite develop?
There is no single cause of a deep bite; in most cases several factors are present together. The main causes are:
- Heredity and jaw structure: A small or retruded lower jaw and a short vertical facial dimension can be a tendency that runs in families.
- Over-eruption of the front teeth: Upper or lower incisors growing longer than they should increases the vertical overlap.
- Insufficient height or loss of the back teeth: When molars are extracted or severely worn, the bite height decreases and the front teeth overlap more.
- Teeth clenching and grinding (bruxism): Long-term wear can contribute to the bite becoming deeper.
- Crowding of the lower front teeth: Lower incisors collapsing backward set the stage for the upper teeth to cover them more.
- Childhood habits: Habits such as lip biting or the lower lip resting behind the upper teeth can affect the position of the teeth.
What happens if a deep bite is not treated?
A mild deep bite may not always cause problems; however, moderate and severe cases can lead to various complaints over time. The most common problems with an untreated deep bite are:
- Tooth wear: Because the front surface of the lower incisors and the back surface of the upper incisors constantly rub against each other, the enamel can wear down and the teeth can become shorter.
- Palate and gum damage: Lower teeth hitting the palate can cause sores, inflammation and tenderness on the roof of the mouth; pressure from the upper teeth on the lower gums can contribute to gum recession.
- Jaw joint complaints: In some people, the lower jaw being pushed back when biting has been associated with pain, clicking and muscle fatigue in the jaw joint.
- Aesthetic effects: The lower third of the face looking short, the lips looking sunken and the lower teeth disappearing when smiling.
- More difficult restorations: Crowns or fillings on the front teeth being under constant load increases the risk of fracture.
For this reason, noticing a deep bite early and correcting it orthodontically when necessary reduces the likelihood of needing more extensive restorative treatments later on.
How is a deep bite assessed?
The degree and source of a deep bite are determined by an intraoral examination together with X-rays and digital records. The dentist measures the vertical overlap of the front teeth to the millimeter, checks whether the lower teeth touch the palate and notes any signs of tooth wear or gum damage. A cephalometric X-ray helps to understand whether the problem stems from the position of the teeth or from the structure of the jawbones. This distinction directly affects which treatment method is chosen.
How is a deep bite treated with braces and clear aligners?
Deep bite treatment is based on rearranging the vertical position of the teeth, and in most cases this can be achieved with braces or clear aligners. The main goals of treatment are to intrude the front teeth in a controlled way, to slightly extrude the back teeth if necessary and to correct the inclination of the front teeth.
Treatment with braces
Fixed brackets effectively control the vertical movement of the teeth with specially bent wires, bite ramps and, when necessary, mini-screws. They are often preferred, especially for severe deep bites and in cases where crowding is also significant.
Treatment with clear aligners
With digital planning, clear aligners can intrude the front teeth step by step while maintaining the height of the back teeth. Because the aligners themselves create a biting surface over the front teeth, this feature contributes to treatment in some cases. Small, tooth-colored attachments are bonded to the teeth for the necessary movements, and bite ramps are designed into some aligners. At our clinic, clear aligner treatment is provided with Invisalign. For details, you can read our deep bite treatment with clear aligners page; our article on who clear aligners are suitable for will also help you understand whether your case is generally suitable for this method.
In growing children
If a deep bite is accompanied by a lower jaw that sits too far back, jaw development can be guided with functional appliances during the growth period. In adults with a significant skeletal discrepancy, planning orthodontic treatment together with jaw surgery may come into consideration.
How long does deep bite treatment take and why is retention important?
The duration of deep bite treatment varies depending on the severity of the case, the patient's age and other accompanying problems; in most cases it is completed within 12 to 24 months. Mild cases may be corrected in a shorter time, while cases with a skeletal component may take longer. In clear aligner treatment, wearing the aligners 20–22 hours a day is decisive for the treatment to progress as planned. The exact duration is estimated by the orthodontist after the examination and digital planning.
A deep bite is one of the conditions with a relatively high tendency to relapse after treatment. That is why the retention phase is an integral part of treatment. After active treatment ends, a thin fixed wire is usually bonded behind the lower front teeth and/or clear retainers worn at night are used. Some retainers can include small biting surfaces to keep the front teeth from deepening again. Following the retention period recommended by your orthodontist helps preserve the result for many years.
When should people with signs of a deep bite get an examination in Ankara?
If your lower teeth touch your palate, you notice wear on your front teeth or you often feel fatigue in your jaw joint, it is a good idea not to wait long before seeing an orthodontist. In children, having the first orthodontic check-up around the age of 7 allows differences in jaw development that accompany a deep bite to be caught early. At our clinic in Oran, Çankaya, Funda Pekyılmaz Sarıkaya, specialist orthodontist (Uzm. Dt.), explains the degree of your deep bite and the treatment options suitable for you in detail after the examination and X-ray assessment.
Frequently asked questions
Does a deep bite correct itself?
A deep bite usually does not correct itself; on the contrary, it can become deeper over time with tooth wear or loss of back teeth. In growing children, jaw development can be guided with early treatment. In adults, orthodontic treatment is needed for correction.
Can a deep bite be treated with clear aligners?
Yes, most mild and moderate deep bites can be treated with clear aligners. Intrusion of the front teeth and correction of their inclination are planned digitally, and attachments and bite ramps are used if needed. Severe skeletal cases may require additional methods.
Does a deep bite cause jaw pain?
In some people, a deep bite has been associated with pain, clicking or muscle fatigue in the jaw joint, but not everyone with a deep bite has these complaints. Because jaw pain can have many different causes, a detailed examination is needed. The treatment plan is made based on this assessment.
Do the teeth shift back after deep bite treatment?
A deep bite is a condition with a tendency to relapse, so retention after treatment is very important. When a fixed retainer wire and night-time retainers are used for the recommended period, the likelihood of maintaining the result increases. Regular check-ups also allow possible changes to be noticed early.
