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