单选题:牙本质龋最前缘的改变是(  )。

题目内容:
牙本质龋最前缘的改变是(  )。 A.透明牙本质形成
B.脱矿  ⊙考试大o在线考试中心⊙
C.细菌侵入
D.成牙本质细胞突起脂肪变性
E.再矿化
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