title: What are the most effective teeth-bleaching procedures? Are they safe?
mesh_terms: D000077463:Carbamide Peroxide; D004338:Drug Combinations; D006801:Humans; D010545:Peroxides / Q000627:therapeutic use*; D014073:Tooth Bleaching / Q000379:methods*; D014508:Urea / Q000031:analogs & derivatives* / Q000627:therapeutic use*
chemical_list: D004338:Drug Combinations; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea