crest white strips work....at least on me and all the people i know that have used them. they are not as strong as the kind found in dental offices but they work almost as good as the professional whitening stuff, but it takes weeks instead of minutes. the ingredients used are generally the same as well, just half as potent. they make your teeth really sensitive too (use a anti-sensitivity toothpaste like sensodyne for 3 weeks prior to treatment).