A
tooth (plural
teeth) is a hard, calcified structure found in the
jaws (or
mouths) of many
vertebrates and used to
break down food. Some animals, particularly
carnivores, also use teeth for hunting or for defensive purposes.
The roots of teeth are covered by gums. Teeth are not made of bone, but instead of multiple tissues of varying density and hardness. The cellular tissues that
ultimately become teeth originate from the embryonic
germ layer, the ectoderm.
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