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什麽是乳牙?乳牙共有多少顆?

Publicado por vickong pun     8 de julio de 2021    

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什麽是乳牙?乳牙共有多少顆?

  什麽是乳牙?乳牙共有多少顆?乳牙也叫奶牙,它是人類的第一副牙齒,嬰兒出生後6?8個 月開始萌出,到2~3歲陸續全部萌出.乳牙共有20顆,上下左右 各有5顆,分別稱爲乳中切牙、乳側切牙、乳尖牙、第一乳磨牙和第 二乳磨牙>

                    

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