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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'.
Tooth types. There are four different tooth types in the mouth. The incisors at the front of the mouth have a sharp biting surface and are used for cutting or shearing food into small chewable pieces.There are eight incisors in both primary and permanent dentitions.he molars are the largest of the teeth. They have a large flat biting surface. The function of the molars is to chew, crush and grind food. There are eight molars in the primary dentition and twelve in the permanent dentition.