A system of opposing genetic forces determines why mammals develop a single row of teeth, while sharks sport several, according to a study published today in the journal Science. When completely ...

You probably don’t think much about teeth until a dentist brings them up. But across the animal kingdom, tooth counts can get wild fast. Some sharks go through thousands in a lifetime. Slugs carry ...

These days, all fish have teeth. The shapes of their teeth vary according to diet, ranging from the little pegs of goldfish ...