Refers to animals with two sets of teeth, one deciduous and one permanent. Humans, cats, dogs, and most domesticated animals are diphyodonts.

Refers to animals with two sets of teeth, one deciduous and one permanent. Humans, cats, dogs, and most domesticated animals are diphyodonts.

- monohyodonts (such as rodents and dolphins) have a single set of perm. teeth

- polyhyodonts (such as sharks and crocodiles) have teeth that are replaced continuously