A dental bleach that includes a bleaching agent and a thickening agent. The bleaching agent is typically a peroxide and the thickening agent is polyvinylpyrrolidone. A viscous or sticky dental bleach results. Optionally, a basic agent, light or heat may be added to accelerate bleaching. Bleaching may...http://www.google.se/patents/US6500408?utm_source=gb-gplus-sharePatent US6500408 - Enamel-safe tooth bleach and method for use
