I just want to be sure that I'm doing my teeth no harm in attempting to make them look whiter. If they're actually harming my teeth and only make them cosmetically look whiter, then I don't want to use them. But if they're actually fighting the problem while making them look whiter, then that's all the better. Does it make a difference how expensive the ones you get are?
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They do a small amount of damage that the teeth can sometimes recover from.
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