8 months ago
The teeth that respond best to Whitening are ones with yellow/ orange type stains from organic matter such as coffee, wine, etc. If your teeth are grey, it is because of your enamel being thin and not from staining. Therefore, your teeth wont lighten as well.
Zoom after at home whitening is possible as long as you take a few weeks break in between and go on a high fluoride toothpaste to avoid sensitivity.
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