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人有多少颗恒牙

更新时间: 2020-11-05 00:00:00     

人有28~32颗恒牙,上下颌各有14颗牙齿或者上下颌各有16颗牙齿。

恒牙是指人类六岁左右乳牙开始逐渐脱落,第一磨牙首先长出,大部分恒牙在14岁左右出齐。

关键词: 多少

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