一般恒牙萌出前,乳牙会自动脱落,但有些孩子会出现恒牙已经长出来,而相应的乳牙却顽固如初不肯“让位”的情况,迫使恒牙从乳牙的内侧长出,形成“双层牙”。出现双层牙时,应把乳牙拔掉,以便恒牙位置的有利调整,否则会令牙齿排列不整、咬合不正。 https://twitter.com/DentistLee1/status/1123579445132922880
https://t.me/private_channel_c14370a/847
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