Unverified50% confidenceCautionTime unknown

美白牙擦本质是靠物理摩擦（含微磨料如三聚磷酸钠或硅胶颗粒）擦除牙齿表面着色，只能去除外源性色渍（茶渍、烟渍、咖啡渍），对牙齿内源性发黄（四环素牙、氟斑牙、天生偏黄）完全无效

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Unverified美白效果主要依靠物理摩擦去除表面色渍，对内源性牙齿发黄（如四环素牙、氟斑牙）基本无效91% similar Unverified主要依靠焦磷酸盐和摩擦剂去除外源性色渍（茶渍、咖啡渍），对内源性牙齿发黄（如四环素牙、氟斑牙）基本无效81% similar

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