Teeth

According to Wikipedia- the free encyclopedia,Teeth (singular tooth) are small, calcified, whitish structures found in the jaws (or mouths) of many vertebrates that are used to break down food.
Teeth have to be very hard to withstand all the chewing and crunching of food. The hard material of the tooth is composed of calcium, phosphorus, and other mineral salts. 

We have four different types of teeth, each with a different function:

Incisors for cutting off bites of food.

Cuspids (sometimes called canines because of their long sharp points) for tearing food

Bicuspids (with two points) to tear and crush food

Molars with large relatively flat surfaces to crush and grind food.

The structures of the teeth can be damaged by infectious disease called Caries. What are Caries also known as Decay???