Howard W R
Department of Allied Health, Western Kentucky University, Bowling Green 42101.
J Am Dent Assoc. 1992 Feb;123(2):57-60. doi: 10.14219/jada.archive.1992.0055.
A double-blind clinical trial compared the efficacy and safety of two popular carbamide peroxide tooth whitening products with a placebo agent. After six weeks, both study products produced significantly whiter teeth than did the placebo agent.