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许多家长不太重视孩子乳牙的保护,认为孩子的乳牙迟早要脱落换成恒牙,只要保护好恒牙就行了。其实这种想法极不科学。孩子出生后4～10个月开始出牙,2岁之前基本出齐。乳牙由上下各4颗切牙、2颗尖牙、4颗磨牙组成,共20颗。自6岁开始出第一个恒牙,即第一磨牙,长在全排乳牙之后,7～8岁后乳牙按长出的顺序逐个脱落代之以恒牙。12岁左右出第二磨牙,18岁以后出第三磨牙(又名智齿),一般于20～30
Many parents do not attach great importance to the protection of children's deciduous teeth, that the child's deciduous tooth sooner or later to be replaced by permanent teeth, as long as the protection of the permanent teeth on the line. In fact, this idea is very unscientific. Children 4 to 10 months after birth teeth, 2 years before the basic Qi. Deciduous teeth from top to bottom 4 incisors, 2 canines, 4 molars, a total of 20. Since the age of 6, the first permanent tooth, the first molars, grows after the full-length deciduous teeth, and the deciduous teeth, one after the other, grow out one after the other in the order of growing up. 12 years old a second molars, after the age of 18 out of the third molar (also known as wisdom teeth), usually in 20 ~ 30