The proposed study was designed as a twelve-month, multi-center, double-blind, randomized controlled clinical study involving 394 subjects with 788 lesions. There were three sites participating in this trial: Indiana University School of Dentistry (lead site), Tufts University School of Dental Medicine, and SUNY School of Dental Medicine. Each site submitted a version of the protocol to their respective Institutional Review Board ("IRB") that incorporated the specific institutional and state guidelines and regulations applicable to that site.