Deep Bite Correction UK: How It Works

What is a deep bite and how is it defined?

A deep bite — also referred to as a deep overbite or increased overbite — describes a situation where the upper front teeth overlap the lower front teeth vertically to an excessive degree. In a normal bite, the upper incisors cover approximately 20 to 30 percent of the height of the lower incisors. A deep bite is typically defined as an overlap of 30 to 40 percent or more, though clinical significance depends on whether the lower incisors are contacting the gum or enamel of the upper front teeth. When the lower incisors contact the palatal mucosa, this is called a traumatic overbite and represents a clinical indication for treatment.

What causes a deep bite?

Deep bites are primarily genetic in origin — the vertical jaw relationship and degree of facial height development are largely inherited. Individuals with a reduced lower face height, strong biting musculature, or a brachyfacial (square jaw) pattern tend to develop deep bites. Overeruption of upper and lower incisors is a contributing dental factor, as is loss of posterior tooth support through extraction or significant molar wear. In growing children, prolonged thumb sucking or dummy habits, which hold the front teeth open, can mask a deep bite tendency that becomes apparent when the habit is stopped.

What happens if a deep bite is left untreated?

A traumatic overbite — where lower incisors contact the palate with every bite — causes progressive damage to the gingival tissue and can lead to localised gum recession and bone loss over time. Significant vertical overlap accelerates wear on the back surfaces of the upper front teeth and the incisal edges of the lower front teeth. In some patients with deep bite and Class II Division 2 malocclusion, there is also an increased risk of temporomandibular joint symptoms. Deep bites in children are more likely to progress if untreated and are generally easier to correct during the growth phase.

How is deep bite treated with fixed braces?

Fixed braces are the most predictable method of deep bite correction. The orthodontist uses several mechanical approaches — often in combination — to reduce the overbite. Incisor intrusion moves the upper or lower front teeth upward into the bone using utility arches, reverse curve of Spee wires, or miniscrew anchorage (TADs) for severe cases. Bite planes or bite turbos — small composite pads placed on back teeth — take the bite out of contact and allow tooth movements to progress. These are temporary components removed once the deep bite has been corrected.

Can clear aligners correct a deep bite?

Correcting a deep bite with clear aligners is achievable but more challenging than with fixed braces, particularly for severe cases. Aligner systems address deep bite primarily through virtual bite ramps — raised sections in the aligner that act as built-in bite planes. In growing adolescents this approach can be effective. In adult patients where the deep bite has a significant skeletal component or requires substantial incisor intrusion, fixed braces may be necessary for predictable correction. The management of a deep bite should be explicitly discussed when assessing suitability for aligner treatment.

Is deep bite treatment available on the NHS?

Deep bite with palatal trauma carries a high IOTN dental health component score — typically DHC grade 4 or 5 — and patients meeting this threshold are eligible for NHS orthodontic treatment if they are under 18 and referred by their GDP. NHS treatment for deep bite in adults is exceptionally rare and generally limited to cases combined with surgical treatment under consultant orthodontist care. Growing children with traumatic overbites should be assessed and referred promptly, as early treatment produces more stable results.

Deep bite correction timeline, step by step

Correction starts with records: photos, scans and usually X-rays, including a lateral cephalogram to show whether the deep bite is dental or skeletal. Braces or aligners are then fitted, and the first months focus on levelling and aligning the teeth, often with bite turbos or aligner bite ramps propping the back teeth apart. The bite is opened gradually over the middle phase, then detailed and settled before the appliances come off. Most cases take 12 to 24 months of active treatment, followed by long-term retainers.

What affects the cost of deep bite correction?

Deep bite correction is usually priced as part of a full orthodontic treatment rather than as a separate item. The main cost drivers are how severe the bite is, whether fixed braces or aligners are used, how long treatment runs, whether miniscrews (TADs) or bite turbos are needed, and whether retainers are included. Children who meet the NHS threshold are treated free, while adults almost always pay privately. Ask for a written quote that lists records, appliances, reviews and retainers so you can compare like for like.

When does deep bite correction need jaw surgery?

Jaw surgery is considered when a deep bite is mainly skeletal and too severe to correct with braces alone, most often in adults with a short lower face height and a retruded lower jaw. Treatment usually involves around 12 to 18 months of braces before surgery to position the teeth, an operation under a consultant maxillofacial surgeon, then several months of braces afterwards to finish the bite. Surgery for adults is sometimes available on the NHS where there is significant functional need, but criteria are strict and assessed by a hospital team.

Does deep bite treatment relapse?

Deep bite correction has a recognised tendency to relapse over time, particularly in adult patients with a strong skeletal deep bite tendency. The muscles and soft tissues around the mouth exert forces that favour the original bite pattern, and the skeletal structure does not change permanently through orthodontic treatment alone. Long-term retainer wear — ideally both fixed and removable — is particularly important after deep bite treatment. Patients should be warned that deep bite correction has a higher relapse tendency than other types of tooth movement, and that lifelong retainer wear is genuinely recommended.

Useful related pages

This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist.