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人正常是多少颗牙
更新时间: 2020-11-05 00:00:00  

人正常是有32颗牙齿。人一生有乳牙(共20个)和恒牙(28~32个)两副牙齿。人出生后4~10个月乳牙开始萌出,12个月后未萌出者为乳牙萌出延迟。乳牙萌出顺序一般为下颌先于上颌、自前向后,约于2.5岁时乳牙出齐。乳牙萌出时间个体差异较大,与遗传、内分泌、食物性状有关。

关键词: 正常 多少

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