after some recent late night disgusting infomertial viewing, saw a "21 minute teeth whitening system" something about a gel, and a blue light, and making your teeth white in only 21 minutes. I'm extremely sceptical, so was wondering if anyone had bought one, used it, and found out if it works or not. they do have a "30 day money back guarantee" but again, sceptical. no doubt some clause or something prevents you getting your money back. so anyone tried one of the new tooth whiteners, and, if yes, does it actually work????