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11岁儿童有多少颗牙
更新时间: 2020-11-05 00:00:00  

乳牙一般在出生后的6个月开始萌出,到1周岁是萌出8个左右,3周时出齐,6-13岁之间乳牙陆续脱落,恒牙先后萌出,在6-7岁时第一磨牙最先萌出,大部分恒牙在11-13岁出齐,恒牙全部出齐共32个,上、下颌各16个。第3磨牙又称迟牙,一般在17-25岁才萌出,有的人可以终生不出,孩子需要时22颗牙齿以上。

关键词: 儿童 多少

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