Tooth whitening substances

A method of bleaching a plurality of teeth, the teeth having facial, lingual, and incisal surfaces, comprising:

• a) adhesively a tooth bleaching product comprising a flexible polymeric film and a tooth bleaching gel to the facial surfaces of a plarality of teeth, wherein the tooth bleaching gel comprises a tooth bleaching active;
• b) adhesively attaching the flexible polymeric film to the lingual surfaces of the plurality of teeth;
• c) conforming the flexible polymeric film to the facial surfaces of the plurality of teeth;
• d) conforming the flexible polymeric film to the lingual surfaces of the plurality of teeth, wherein the flexible polymeric film is disposed about the incisal surface of the plurality of teeth;
• e) conforming the flexible polymeric film to interstitial spaces between the plurality of teeth;
• and
• f) peeling the flexible polymeric film from the plurality of teeth.

A system for bleaching a plurality of upper teeth, the teeth having facial, lingual, and incisal surfaces, comprising:

• a) a plurality of tooth bleaching products, each tooth bleaching product comprising a substrate that receives a tooth whitening gel, wherein the substrate consists essentially of a flexible polymeric film that is sized to cover the facial, lingual, and incisal surfaces of a plurality of teeth, wherein the polymeric film adhesively attaches to the facial and lingual surfaces of the plurality of teeth during use and wherein the polymeric film is conformable to interstitial tooth spaces during use;
• b) the tooth bleaching gel comprising a tooth bleaching active;
• and
• c) wherein the system comprises a sufficient number of the tooth bleaching products to apply a new polymeric film once a day for between about 7 days and about 14 days.