Hypodontia and Orthodontics UK — Missing Teeth from Birth

What is hypodontia and how common is it?

Hypodontia is the congenital absence of one or more permanent teeth, excluding third molars (wisdom teeth). It is the most common developmental dental anomaly, affecting approximately 5 to 8% of the UK population when wisdom teeth are excluded. Including wisdom teeth, the prevalence rises to around 20 to 25%. Hypodontia can occur in isolation — with no other associated conditions — or as part of syndromes such as ectodermal dysplasia. The condition is largely genetic in origin and often runs in families, though the inheritance pattern can be complex. It may affect a single tooth or multiple teeth; the term oligodontia is used when six or more teeth (excluding third molars) are absent.

The teeth most commonly missing in hypodontia

The pattern of missing teeth is consistent across populations. In the permanent dentition, the teeth most frequently absent are: lower second premolars (the most commonly missing tooth, accounting for around 40% of hypodontia cases), upper lateral incisors (the small teeth flanking the upper central incisors), and upper second premolars. Wisdom teeth are the most commonly missing teeth overall but are not counted in hypodontia classifications. Less commonly, lower central incisors, canines, or first premolars may be absent. The missing teeth are often symmetric (absent on both sides) but not always. In some patients, the corresponding baby (deciduous) tooth is retained into adulthood because no permanent successor exists to push it out.

Space closure vs space opening — how the decision is made

The most fundamental treatment planning question in hypodontia is whether to close the space left by the missing tooth orthodontically, or to open and maintain the space for a future dental restoration such as a bridge or implant. The decision depends on multiple factors: the specific tooth missing and which teeth would be used to close the space; the patient's skeletal pattern and bite (Class II patients may benefit from space closure using the space to retract front teeth; Class III patients generally should not); the size and appearance of adjacent teeth that would be repositioned; the patient's age and growth stage; and patient and family preference. Upper lateral incisor hypodontia is a common scenario where the canine can be moved into the lateral position and reshaped, or the space can be maintained for a later implant or bridge.

Orthodontic treatment for hypodontia

Fixed braces are the most common orthodontic appliance for hypodontia treatment and give the most precise control over tooth positions and space management. Treatment planning must consider the final restorative outcome — spaces that will be restored with implants or bridges need to be the correct width and the adjacent teeth need ideal angulation. Where a retained baby tooth is present, the timing of its extraction must be carefully planned to avoid prolonged space loss. Clear aligners can be used in some hypodontia cases but fixed braces are generally preferred for complex multi-tooth presentations. Treatment is often longer than average — 18 to 36 months — because of the complexity of creating or closing spaces while managing the overall bite.

Does hypodontia qualify for NHS treatment?

Hypodontia generally attracts a high IOTN (Index of Orthodontic Treatment Need) score because congenital missing teeth are explicitly listed in the IOTN dental health component. The absence of any tooth other than a third molar scores at least IOTN 4 (definite need) and multiple missing teeth often score IOTN 5 (very great need). This means most children with hypodontia qualify for NHS orthodontic treatment. NHS treatment is available to under-18s; adults over 18 are not normally eligible. Waiting lists vary by area. Some complex hypodontia cases are treated in specialist NHS orthodontic departments attached to dental hospitals, particularly where restorative or surgical input is also needed.

Who is on the multidisciplinary team for hypodontia treatment?

Hypodontia treatment rarely involves an orthodontist alone. Depending on the treatment plan, the team may include: the general dentist managing ongoing oral health and any retained baby teeth; the orthodontist planning and delivering tooth movement; a restorative or prosthodontic dentist planning and providing final restorations such as bridges, veneers, or composite build-ups; an implant dentist or oral surgeon if implants are planned (implants cannot be placed until growth has completed, typically mid-to-late teens for girls, late teens to early twenties for boys); and a clinical nurse specialist in settings treating patients with syndromic hypodontia. Coordination between these specialists is essential and is best achieved through a combined clinic where possible.

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.