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What is non-dental caries?

　　Internationally renowned dental experts said, referring to non-dental caries is a cracked tooth. As the cracked tooth enamel can cause damage, therefore patients will eat hot and cold sweet and sour, because of food-related pain caused by irritation phenomena. If the patient to the hospital and found no dental caries will be the phenomenon.

原文翻譯如下：

什么叫做非齲性牙��？