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两岁半应该多少颗牙
更新时间: 2020-11-04 00:00:00  

两岁半18到20颗牙就是正常的。小儿一般6个月左右开始出牙,乳牙2-2、5岁出齐,两岁半宝宝乳牙出齐的话,应该是20颗。6岁左右开始出第一颗恒牙,也就是第一磨牙,7-8岁乳牙按照长出的先后顺序逐个脱落。12岁左右出第二磨牙,18岁以后出第三磨牙(智齿)恒牙共32颗,当然也有终身不出智齿的,那么就是28颗牙齿。

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