Sixty-five qualifying male and female subjects were randomly assigned one of the two test powered brushes ( Spinbrush Truly Radiant Deep Clean [ TRDC ] or Spinbrush Truly Radiant Extra Whitening [ TREW ] , Church & Dwight Co. , Inc. , Princeton , NJ , USA ) or an ADA standard manual toothbrush ( MT ; American Dental Association , Chicago , IL , USA ) according to one of three computer-generated sequences .