I used to have really yellow teeth from drinking so much coca-cola. I bought teeth whitening stuff from stores, but they wouldn't work. I looked on the ingrediants to see what was in it, and I saw hydrogen peroxide. So I took a swig of hydrogen peroxide, and swirled it around my mouth, (just like mouthwash) and left it in for a minute. I saw a difference in just 2 days!
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