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小孩换牙是换多少颗

更新时间: 2020-11-04 00:00:00     

孩子换牙一共换20颗,乳牙一共20颗在2岁左右出齐,从6岁左右开始换牙,恒牙一共28~32颗在14岁左右出齐。一般从出生后的4~10月开始长出乳牙,到2岁左右乳牙出齐,一共20颗。恒牙一般是从6~7岁开始长出替代乳牙,一般在12~13岁左右乳牙完全被恒牙所代替,14岁左右恒牙多能出齐,但是第三磨牙多出牙较晚,有可能会在成人之后长出,也有些人终身不出。

关键词: 小孩 多少

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