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小儿乳牙出齐共多少颗
更新时间: 2020-11-04 00:00:00  

小儿乳牙出齐一共是20颗,婴幼儿一般是在6至12个月左右开始萌出第一颗乳牙,到2岁半左右20颗乳牙萌出。人的一生总共有两副牙列,第一副牙列称为乳牙列,自6至7岁至12至13岁,乳牙逐渐被恒牙代替。恒牙是乳牙脱落后的第二副牙列,如果意外掉落就没有另外一副牙可以换。

关键词: 小儿 多少

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