I've always had yellow teeth, even as a kid. My teeth are healthy and I've never smoked or drunk much coffee or wine. I've tried two different do it at home whitening kits, that other people have had great results with (crest whitening strips and 22% carbamide peroxide) while I was unable to see any difference at all. I've already considered having it done professionally but I wonder if naturally yellow teeth can even be whitened
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