What is Dentition?

How many types of teeth are there in the bucal cavity?

Cheek teeth consist of ....... and . . ....

What is the of a person who study teeth? 

In Skeptics.SE, a question regarding the skulls of childrenarose. Depicting a scary skull where the permenent teeth are"hidden" inside the jaws and the milk teeth are in the theirplace.

After all milk teeth fall out, and the permanent teeth "rise",do the holes left by them filled up, or do we go around with holesin our jaws?

Do animals suffer from tooth decay, such as cavities? Is it tothe same extent as in humans, or do animal teeth decay more orless? If teeth decay in animals as well, are there naturalstrategies animals use to heal it? And, lastly, how do animals takecare of their teeth?