| safe teeth whitening? i got this teeth whitening thing in the mail for free. normally i don't do any teeth whitening stuff, except for the toothpaste that says it whitens. i was wondering if the at home whitening things are safe. i figure since i have it, might as well try it. it says it's 12% hydrogen peroxide. the full list of ingredients is propylene glycol usp, glycerin usp, hydrogen peroxide usp, carbomer, triethanolamine, flavoring. any ideas or advice on this? |