“酸会损伤牙釉质，使其软化。”Dr . Jones说。

"Acid weakens enamel and makes it softer," Dr. Jones says.

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刷牙力气过大更容易损伤你的牙釉质。 。

Thee chances of enamel breakage are greater when you brush too hard.

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但牙医提醒说，有些方法可能会损伤覆盖在牙齿上的牙釉质，反而让牙齿显得更黑。

But dentists said some of the methods can erode the enamel covering of the teeth making them appear darker rather than whiter.

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