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什麽是乳牙？乳牙共有多少顆？

Posted By vickong pun     July 8, 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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