牙齿——这台收割机,强硬、健壮,其撕裂并碾磨食物的劳作伴随着人类的一生。作为它的主人,你了解牙齿吗?为什么你的牙齿不会东倒西歪牙齿有3个部分,每个部分都有它的名字。牙冠牙冠是牙体暴露于口腔的部分,牙齿看起来白白胖胖的,其实,这只是它的牙冠。牙根牙根是牙体在口腔内不能看见的部分,藏在牙龈和牙槽骨中,就像树根一样牢牢地抓住上下颌骨,使牙齿稳固地扎在牙槽窝内,不至于东倒西歪、左摇右晃。 Teeth - This harvester, tough and sturdy, whose work to tear and grind food accompanies human life. As its owner, do you know your teeth? Why your teeth do not go all out? The teeth have 3 parts, each part has its name. Crown The crown is the part of the tooth exposed to the mouth, the teeth look white and fat, in fact, this is just its crown. Tooth root is the tooth can not be seen in the oral cavity of the part, hidden in the gums and alveolar bone, like the root of the root firmly grasp the mandible, the teeth firmly tied in the alveolar fossa, , Shake left and right shake.