Malocclusion is a problem in the way the upper and lower teeth fit together in biting or chewing. Malocclusion literally means "bad bite." The condition may also be referred to as an irregular bite, crossbite, or overbite.

Malocclusion may be seen as crooked, crowded, or protruding teeth. It may affect a person's appearance, speech, or ability to eat.

Malocclusions are most often inherited, but may be acquired. Inherited conditions include too many or too few teeth, too much or too little space between teeth, irregular mouth and jaw size and shape, and atypical formations of the jaws and face, such as a cleft palate. Malocclusions may be acquired from habits like finger or thumb sucking, tongue thrusting, premature loss of teeth from an accident or dental disease, and medical conditions such as enlarged tonsils and adenoids that lead to mouth breathing.

Malocclusions may be symptomless or they may...