All teeth have a corresponding role in eating, called the chewing function. The incisors play a primarily cutting function, that is, the upper and lower front 8 teeth, which themselves are shovel-shaped, play a primarily cutting role. Further back the cusp plays the role of tearing food, and this tooth is the third tooth, sometimes called the tiger’s tooth. Further back are the premolar and molar, the teeth mostly play the role of grinding, can chew the food in the mouth as much as possible, in which the most important is the first molar and the second molar, in the chewing efficiency is the most important two teeth.