I'd like to maybe whiten my teeth but I'm worried that doing so will scrape off my already weak teeth? When they whiten them, do they simply bleach them or do they try to take off the stains? for some reason i don't like the thought of just bleaching my teeth instead of getting the actual stains off.
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If you have your teeth cleaned first, they will scrape off any deposits (commonly called tartar) and remove any surface stains with instruments and then polish. If you're just doing the bleaching, the bleach gets into the pores of the teeth and whitens them. So it just depends on what you're having done. And cleaning or bleaching will not harm your teeth, even if they are already "weak".
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