ughhhh, i was at my friends house and decided to use her crest stripes just for the hell of it (she got em free). i liked them ok, so i went back i used them again.. and ah!!!! it was horrible. my gums burned really bad and my teeth/gums ached + it kept givin me the chills for the rest of the day. it sucked. maybe i just have really sensitive teeth, but nothin like that has ever happened to me before.
