http://articles.mercola.com/sites/articles/archive/2005/11/12/beware-of-teeth-whitening.aspxConventional tooth-whitening kits can result in a host of problems for your mouth, gums, teeth, and health in general. Swallowing Bleach Standard tooth bleaching kits come with a mouth tray that may not fit snugly, which can result in the bleaching agentenCommunityServer 2008.5 SP1 (Build: 31106.3070)