牙齿的分类 Classification of teeth 哺乳动物的齿式可以写作：（上）门牙数，（上）犬牙数，（上）前臼齿，（上）臼齿/（下）门牙数，（下）犬牙数，（下）前臼齿，（下）臼齿，比如人的齿式可以写作2，1，2，3/2，1，2，3.。表示人上颌一侧的牙齿切齿有2，犬齿1，前臼齿2，后臼齿3，下颌也是如此。齿式是哺乳动物的分类的重要依据。 Mammals: (on the) number of teeth, the tooth can be writing (in the) number of fangs, premolar, () () on the molar/teeth number (), (the) number of fangs, (under) premolar and molar (), such as man's tooth can be writing 2,1,2,3/2,1,2,3.. The teeth of the maxillary side of the human maxillary side are 2, canine 1, premolars 2, posterior molar 3, and the lower jaw. The tooth type is an important basis for the classification of mammals. 由于人类是属于灵长类，所以人的牙齿的布局以及齿式和其他灵长类是一样的，齿式即2，1，2，3/2，1，2，3。共有32颗牙齿。但人类的牙齿与其他灵长类牙齿也有所不同，最显著的就是人类的犬齿没有其他灵长类的犬齿长而尖锐。这是人科动物与其他灵长类动物最显著的区别，在古人类研究中，常常用此把原始的人科动物和古猿区分开来。虽然人类的犬齿相比较其他灵长类显著退化，但人类的犬齿仍然是相比人的其他牙齿是最强壮的。犬齿的齿根比其他所有的牙齿的都要长，都要粗壮，其齿根深深嵌入到颌骨之中。如果大家不信，大家可以摸摸自己的犬齿的牙龈和齿根，并与其他牙齿相比较。人的犬齿有性别差异，在尸骨的性别鉴定中，是一个重要参考。另外人类的上下颌缩小，使许多人的智齿即最后一幅后臼齿不萌出。许多人一生只有28颗牙齿。 Since humans are primates, the shape of the teeth and the teeth are the same as those of other primates. The tooth type is 2, 1, 2, 3/2, 1, 2, 3. There are 32 teeth. But human teeth are also different from other primate teeth, and most notably, human canine teeth are not as sharp as other primate canine teeth. This is the most remarkable difference between human and other primates, and in ancient human studies, it was often used to distinguish between primitive and primitive animals. Although human canine teeth are significantly degraded compared with other primates, human canine teeth are still the strongest in comparison to other human teeth. The root of the canine tooth is longer than all the other teeth, and should be strong, and its root is deeply embedded in the jawbone. If you don't believe it, you can touch your canine gums and teeth and compare them with other teeth. The gender difference in canine teeth is an important reference in the identification of the bones. In addition, the mandible of the human lower jaw shrinks, making many people's wisdom teeth the last rear molars. Many people have only 28 teeth in their lives.