An overbite is where the upper front teeth overlaps the lower front teeth. Some people may have a slight overbite or 1 or 2 millimeters, however others may have a more serve overbite. An overbite which is too small or too large can cause dental issues such as palatal trauma (trauma to the roof of the mouth) or wear to the teeth. Overbites are commonly seen in children with parents who have or had them. An overbite can be exacerbated by habits such as thumb sucking, prolonged use of a pacifier or lip biting and in people with a tongue thrust (the tongue frequently pushes against the teeth when swallowing).