摩擦剂是牙膏的主要成分，通过颗粒状摩擦材料在牙齿表面反复摩擦后，去除物体表面上附着的物质。
不要忘了防摩擦剂。
产品说明：该产品能将铜的氧化物还原，并带有一定的摩擦剂可以彻底去除铜锈，并且不伤铜材本身。
Instructions: the product can deoxidize the coppers. It contains certain friction producing substance and can remove the rust completely without damage the copper.
很少有美白牙膏经过任何形式的临床试验，有些美白牙膏摩擦剂含量过多，会伤害你的牙齿或让你的牙齿变得过分敏感。
Very few whitening toothpastes have undergone any type of clinical trial, and ones that are too abrasive can damage teeth or make them very sensitive.
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