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本世纪初人们开始注意牙齿异常症,直到1931年 Churchill,Smith 和 Velu 几乎同时发现氟是引起该病的病因并称为斑
At the beginning of this century, people began to pay attention to dental anomalies. Until 1931, Churchill, Smith, and Velu found almost the same time that fluoride was the cause of the disease and was called plaque.