Crossbite Treatment Options UK

Types of crossbite and how they differ

A crossbite occurs when one or more upper teeth sit inside (behind) the lower teeth when biting, rather than outside. Anterior crossbite affects the front teeth — one or more upper front teeth bite behind lower front teeth. Posterior crossbite affects the back teeth — upper back teeth sit inside the lower back teeth on one or both sides. Unilateral posterior crossbite (one side only) often involves a jaw shift on closing that can contribute to jaw asymmetry over time if untreated. Bilateral posterior crossbite (both sides) is often related to a narrow upper arch. The type, position, and cause all influence which treatment approach is appropriate.

Causes of crossbite

Posterior crossbite is commonly caused by a narrow upper jaw (maxilla) relative to the lower jaw, which may be developmental or genetic. Prolonged thumb sucking can contribute by narrowing the upper arch. Anterior crossbite can result from a single upper tooth that has erupted in an incorrect position, or from a skeletal pattern where the lower jaw is positioned forward relative to the upper (Class III relationship). The cause matters because dental crossbites (single tooth in wrong position) are managed differently from skeletal crossbites (jaw relationship).

Treatment options for crossbite

Anterior crossbite of a single tooth: often corrected with fixed braces or a simple removable appliance that tips the tooth forward. Posterior crossbite in growing children: palatal expanders (removable or fixed rapid palatal expanders — RPE) widen the upper arch to correct the crossbite before or alongside brace treatment. This is most effective during growth. Posterior crossbite in adults: dental camouflage with fixed braces is possible for mild cases; surgical expansion (SARPE) or jaw surgery may be needed for significant skeletal discrepancy. Aligners can address mild crossbites, particularly dental ones.

Why crossbite in children may benefit from early treatment

Posterior crossbite with a jaw shift is often treated earlier than most orthodontic conditions — ideally while the child is still growing and the upper arch suture is responsive to expansion. Treating a crossbite with jaw shift at age 8–10 can correct the jaw deviation before it becomes habitual or structural. Early expansion also creates space for incoming permanent teeth, potentially reducing crowding. This is one of the few orthodontic presentations where early intervention is generally favoured rather than waiting for all permanent teeth.

Aligners for crossbite correction

Clear aligners can address anterior dental crossbites and mild posterior crossbites in adults effectively. They are less suitable for significant skeletal crossbites, bilateral narrow arches needing substantial expansion, or cases in growing children where expansion appliances are more efficient. For complex posterior crossbite, fixed expansion appliances followed by fixed braces or aligners is the standard pathway.

NHS eligibility for crossbite treatment

Crossbite with a jaw shift (mandibular displacement) commonly qualifies for NHS orthodontic treatment in under-18s at IOTN Grade 4. Single-tooth anterior crossbite causing significant displacement also typically qualifies. NHS waiting lists in England are typically 2–3 years. Adults are not routinely eligible for NHS orthodontic treatment, but significant functional crossbite in adults may be considered for hospital referral.

Useful related pages

Crossbite assessment depends on which teeth are affected, bite function, jaw width, age, and clinical records. Treatment suitability must be confirmed by a clinician.