http://www.metacafe.com/watch/843480/whiter_teeth_really_cheap/ I found this on metacafe and seems to be legit and safe. I see no dangerous chemicals involved.
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Teeth whitening doesn't really fit into the realm of being 'safe' or really being 'dangerous'. The only real danger bleaching has is that it can lead to sensitivity in teeth as well as gum tissue, depending upon (1) patient use frequency (2) percentage of bleach in whitening gel (3) patient tolerance. Whether or not it is safe, no one i have heard of has died or developed any medical complications due to its use. Teeth whitening is more of an esthetic choice to make, rather than a medical one. The materiels used have all been tested, and each company has their own formula. The bleach, while you shouldn't eat it, can sometimes go down your throat during use, but its safe, so that shouldn't make you grow an extra eye or anything like that. If you're worried about it, you can always start on the lower percentage bleaching materials, like the crest whitestrips or whatnot, and see how that works for you. If you want something more powerful, you would have to see your dental professional. Do note that if your a smoker or coffee/tea drinker, its going to be tough to bleach your teeth, since nicotine and caffeine do cause staining. Just a side note.
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