Objective:To explore the treatment of front teeth defect or absence.

目的：探讨前牙修复的方法。

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What is the defect of the structure of the tooth(teeth)?

什么是牙齿结构上的缺陷呢？

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What is the defect of the structure of the tooth(teeth)?

什么是牙齿结构上的缺陷呢？

youdao