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i use nite white excel 3, the deluxe kit. cost a lot, but works great. you get custom teeth molds made, and put this gel stuff in it, wear it for 2 hours a day for a week, or until your teeth are at the whiteness you want. then about once a month just wear the molds with gel for 2 days, 2 hrs a day to touch up the whiteness.
works less well if you drink soda/coffee or if you smoke.
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