Ditto on the tooth damage due to whitening. I would seriously beware of any over-the-counter stuff. Let your dentist take care of this matter, if it is that important to you, and even then there is risk.
My mom is a prime example - she's a real tooth-whitening nut, and tried everything out there. In the end she had brilliant white teeth - with the front side all dented and melted off. She had to go to the dentist to have that front side dremeled off and replaced with fake molds. She can't chew tougher foods now, because she's afraid the molds will come off, but at least she feels she is socially acceptable now.
Is this what you want to end up with? Is it really worth it?
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