Overjet Treatment Options

Overjet vs overbite: understanding the difference

Overjet is a horizontal measurement — the distance the upper front teeth project forward beyond the lower front teeth when measured from the front of the lower incisors to the back of the upper incisors. A normal overjet is 2–4mm. Increased overjet (commonly called 'buck teeth' colloquially) means the upper front teeth protrude significantly. Overbite is a vertical measurement — the vertical overlap of the front teeth. These are separate measurements but both affect treatment planning and both can be increased simultaneously.

Overjet and bite planning

Overjet can result from tooth position (upper front teeth tipped too far forward, lower front teeth tipped too far back), jaw relationship (lower jaw positioned too far back relative to the upper jaw — Class II skeletal pattern), habits (prolonged thumb sucking can push the upper front teeth forward and tip the lower front teeth back), or a combination of these factors. The plan differs significantly: dental overjet can often be corrected with orthodontic tooth movement alone; skeletal overjet may need functional appliances in growing teenagers or jaw surgery in adults.

Treatment options for overjet

Fixed braces with Class II elastics (worn between upper and lower teeth to apply corrective force) are the standard approach for dental overjet correction in teenagers and adults. Upper premolar extractions may create space for the upper front teeth to retract into. Functional appliances (Twin Block, Herbst) modify the jaw relationship during growth in teenagers, reducing skeletal overjet before or alongside fixed brace treatment. Clear aligners with Class II elastics can address moderate overjet in suitable adult cases. Orthognathic (jaw) surgery is the appropriate option for significant skeletal overjet in adults where the jaw relationship cannot be camouflaged orthodontically.

Overjet treatment timing for children and teenagers

The ideal timing for overjet treatment in teenagers depends on jaw growth stage. Functional appliances work best during the pubertal growth spurt (typically 11–13 years in girls, 12–14 in boys). Starting functional appliance treatment too early or too late reduces effectiveness. Fixed brace treatment for the remaining dental correction usually follows. Early assessment by an orthodontist around age 9–10 is worthwhile for children with significant overjet — it identifies whether growth-modification is likely to help and sets the timing for intervention.

Trauma risk with increased overjet

Increased overjet is associated with higher risk of dental trauma — upper front teeth that protrude are more exposed to impacts during falls, sport, or accidents. Studies show that children with an overjet of over 6mm have approximately double the risk of dental trauma to the upper incisors compared to those with normal overjet. This is one clinical justification for early treatment in children with significant overjet, alongside appearance and bite function.

Retention after overjet treatment

Retainers are essential after overjet correction. Fixed wires behind the upper and lower front teeth protect the corrected position long-term. For cases that required premolar extractions, the extraction spaces must be kept closed by the retainer — if the retainer fails, the front teeth can tip back forward into the closed spaces. Patients who had Class II elastics as part of their treatment should understand that the bite correction component relies on retainers just as much as the alignment component.

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.