牙的分类
The classification of the tooth

 
牙齿可以分成乳牙和恒牙。
Teeth can be divided into baby teeth and permanent teeth.

 
[牙的分类] 牙的分类图册
Classification of teeth

 

 
乳牙分成三类：
There are three types of milk teeth:
1、乳切牙
1. Milk cutting teeth
2、乳尖牙
2. Milk fangs
3、乳磨牙
3. Milk grinding teeth
恒牙分成四类：
The permanent teeth are divided into four categories:
1、切牙
1, incisor
2、尖牙
2, fangs
3、前磨牙
3. Front grinding teeth
4、磨牙
4, molar

 

 
乳牙的萌出一般是从宝宝第六个月开始萌出4颗，到二十个月差不多20个乳牙。
The cuteness of the baby teeth usually starts from the first six months of the baby and starts to sprout four, to 20 months and 20 teeth.

 
[乳牙的萌出] 乳牙的萌出图册
The cuteness of the baby teeth

 

 

 
恒牙的萌出顺序一般是第一磨牙（6-7岁）、中切牙（7-8岁）、横切牙（8-9岁）、第一双尖牙（10-11岁）、第二双尖牙（10-12岁）、尖牙（11-12岁）、第二磨牙（12-13岁）、第三磨牙（17-21岁）
Permanent teeth eruption sequence is usually the first molars (6 to 7 years old), the cutting teeth (7-8 years), transverse tooth (8 to 9 years old), the first pair of teeth (10-11), a second pair teeth (10 to 12 years of age), fang (11-12 years old), the second molars (12-13), the third molars (17-21)

 

 
[恒牙的萌出] 恒牙的萌出图册
The cuteness of permanent teeth

 

 
牙的功能
The function of the teeth

 
1、咀嚼：是咀嚼肌群依次收缩所组成的复杂的反射性活动
1. Chewing: is a complex reflex activity composed of masticatory muscle groups
2、发音和言语
2. Pronunciation and speech
3、保持面部的协调美观
3. Keep the facial coordination beautiful