The division and its functional teeth.

Teeth are cut when people eat food, the Food and tear food grinding an indispensable tool. If there are no teeth, can not cutting and grinding food, increase the burden on the gastrointestinal tract; Moreover, because a lot of food can not eat, from eating types incomplete, is bound to result in the absence of certain substances. Therefore, through the teeth of rough food, the food can be absorbed from the gastrointestinal tract to digest after the use of the human body. Teeth on the food processing is the division of labor. In accordance with its division of the different, generally fall into three groups as follows:
1. Incisor group: incisors may cut food into pieces. We mouth of the incisors (also known as the incisors), to have such a function. Incisor use of margin in masticator muscle synergies, cut food into pieces. In a four incisors, and in the adjacent lateral incisor teeth, there are four. And lateral incisor teeth in the composition of incisors group.
2. Canine groups: canine can tear food, because it is large and root length, has been deeply buried in the jaw, can withstand greater force. There are four canines, composed of Canine group.
3. Molars Group: incisor bite down food or Canine torn off to the food, transportation from the tongue to Tai molars for grinding. Molar from the surface of many of the ditch and the ridge formed, like stone, to grind food, for gastrointestinal digestion and absorption. After the premolars and molars have to grind food, so the premolars and molars after the group collectively known as The molars. One premolar 8, after the molars eight or 12. Deciduous group of eight incisors, four canines group, the eight group molar teeth. Each group of deciduous teeth and permanent teeth of the functions of the same group. The deciduous teeth before the permanent teeth can be divided into groups and later group. Previous group including 1 to 3 teeth, a total of 12. No. 4 to no. 8 teeth known as the later group.