智齒有2-3牙根，多數的牙根是向分離方向生長的，而牙槽的出口很小，必須鑿開牙槽骨的出口，才有可能將智齒拔出。

來源: 禦用文人於 2015-03-30 12:17:39 [舊帖] [給我悄悄話] 本文已被閱讀：次

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