My teeth weren't originally white, but lately I've been paying more attention to themㅠㅠ My skin is quite fair, so they seem to look more yellow somehow. I don't even drink coffee... I'm curious if teeth whitening really works and how long the effects last!!! Also, since my teeth are somewhat weak, I experience slight sensitivity, so I wonder if teeth whitening is possible... Please share experiences from those who have actually tried it :)
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