What causes orthodontic problems?

Most orthodontic problems are inherited, including tooth size and jaw size, and may lead to crowding of teeth or spacing of teeth. Overbites, underbites, extra or missing teeth, and irregularities of the jaws, teeth, and face also are inherited. Other orthodontic problems can be caused from accidents, pacifier or thumb sucking, dental disease, or the premature loss of either the primary or permanent teeth.

What habits contribute to "bad bites"?

A number of childhood habits can lead to orthodontic problems, such as thumb or finger sucking, sucking on a pacifier, sucking on a lip, mouth breathing (often caused by enlarged tonsils and adenoids), fingernail biting, and "tongue thrust."

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