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宝宝乳牙要换多少颗

更新时间: 2020-11-04 00:00:00     

宝宝乳牙要换20颗,幼儿6个月左右开始萌出乳牙,2~3岁时,乳牙全部萌出,共20个。

乳牙(deciduousteech),人萌生的第一组牙,共20个,上、下颌各10个。人的一生总共有两副牙列,第一副牙列称为乳牙列,是由20颗乳牙排列而成。从出生6个月左右开始萌出第一颗乳牙,到2岁半左右20颗乳牙萌出完毕。自6~7岁至12~13岁,乳牙逐渐脱落而被恒牙所替代。恒牙是继乳牙脱落后的第二副牙列,若因疾患或意外损伤而致脱落后再无牙替代。

关键词: 宝宝 多少

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