Overbite is the vertical overlap of the upper and lower front teeth; overjet is the horizontal distance the upper front teeth project ahead of the lower teeth. A child can have one, both, or neither. The amount, cause, growth pattern, lip coverage, trauma risk, gum effects, and bite function determine whether monitoring or treatment is appropriate.

Understanding the two measurements

When the teeth close, the upper incisors normally overlap the lowers to some degree. Excessive vertical overlap is commonly called a deep bite. Overjet is measured front to back; a larger overjet may make upper incisors appear prominent. Parents often use “overbite” for both, but the distinction matters because they can arise from different tooth inclinations, jaw relationships, eruption patterns, or habits. A photograph from the front alone may not show horizontal projection accurately.

Why the bite developed this way

Genetics, jaw growth, tooth size and position, early tooth loss, crowding, lip and tongue posture, digit habits, and eruption can contribute. Increased overjet may accompany a lower jaw that sits farther back, upper incisors that tip forward, or both. A deep bite can reflect front-tooth eruption, back-tooth height, jaw rotation, or tooth inclination. Identifying the components prevents an appliance from being chosen solely by the visible label.

When it may affect health or safety

Prominent upper incisors with limited lip coverage can face greater trauma risk during falls or sports. A severe deep bite may cause lower incisors to contact the palate or contribute to gum trauma and wear. Mild findings may be stable and symptom-free. The orthodontist assesses growth, tooth eruption, facial balance, speech or function, gum tissue, wear, and your child's developmental stage. Treatment timing may differ even for children with similar measurements.

What treatment can involve

Options may include observation, habit management, growth-modifying appliances in selected growing patients, limited early treatment, braces, clear aligners, elastics, bite-opening mechanics, or comprehensive treatment later. No appliance can guarantee a particular jaw-growth response. Retention and long-term stability depend on the original cause and final bite. The family should understand whether the plan changes tooth position, guides growth, protects against trauma, or addresses several goals at once.

When to contact the dental team sooner

Arrange an orthodontic evaluation when upper front teeth are frequently injured, the lower teeth bite into the palate, gum trauma is visible, your child cannot close the lips comfortably, or the bite is changing quickly. Acute tooth injury requires prompt dental care.

Questions parents often ask

Is an overjet the same as buck teeth?

“Buck teeth” is a nonclinical label that can feel shaming. Increased overjet or incisor prominence describes the finding more accurately.

Can a child outgrow an overbite?

Growth and eruption can change the bite, but some patterns persist or worsen. Monitoring should be based on measurements and development rather than hope alone.

Do braces fix jaw position?

Braces move teeth. Growth-modifying appliances may influence jaw relationships in selected growing patients, while severe skeletal differences may need other planning.

A practical next step

Every question here has a general answer and a specific one, and the specific one depends on your child. When you want that, call us at (201) 345-3637 and we'll give you a plan that actually fits.

Sources

American Academy of Pediatric Dentistry, Reference Manual of Pediatric Dentistry
American Dental Association, MouthHealthy patient education
American Association of Orthodontists, patient education

Overbite vs. Overjet in Children