酸袭击可能发生，由于牙菌斑的细菌作用于我们饮食中的糖，或作为一个直接结果，酸溶解食物上溶掉了在我们牙齿表面上的珐琅。
Acid attacks can happen as a result of plaque bacteria acting on the sugars in our diet, or as a direct result of the acids in food dissolving away the enamel on the surfaces of our teeth.
德国的科学家利用X射线光电光谱得到了牙齿在氟化物处理后的表面细节图像。
Scientists in Germany used X-ray photoelectron spectroscopy to get a detailed image of the surface of a treated tooth.
增白牙膏将可以去除牙齿表面色斑，比如由吸烟，喝茶或咖啡引起来的。
Whitening toothpastes will remove only surface stains, such as those caused by smoking, tea or coffee.
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