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Molars = These are larger than premolars and extremely variable depending on the animal's diet. Like premolars they are used for crushing and grinding food, and like premolars their upper surfaces have ridges called cusps on them. Molars normally have three to five cusps and two or three roots. In humans we call the third molars, those closest to the back of the mouth 'Wisdom Teeth'.
Hereâs a quick overview of the different types of teeth in an average mouth: 1  Incisors â the sharp, chisel-shaped front teeth (four upper, four lower) used for cutting food. 2  Canines â sometimes called cuspids, these teeth are shaped like points (cusps) and are used for tearing and grasping food.