Okay, so I did a search and found some older topics on this, but they didn't really help. I tired using the Crest Strips Premium and OWWWW was I in major pain. I spaced them out at once per day as opposed to two, because I read that a few people get sensitivity. No amount of pain killers helped either, I even tried the horse pills they gave me after a wisdom tooth extraction. So I'm pretty sure all the Zoom and BrightSmile whitenings are out of the question since they also use peroxide. Did anyone have experience with GoSMILE? They claim that they avoid the problem of sensitivity. I don't want to waste $90 on another useless thing. As it is, my FH thinks that I'm still using the strips and they're just not helping lol. Thanks!