Relative to the manual toothbrush group , after four weeks of use the Colgate ProClinical C200 toothbrush , with either the triple clean head or sensitive head , provided statistically significantly greater reductions in whole mouth plaque index scores ( 78.6 % , and 82.1 % , respectively ) , in gingival margin plaque index scores ( 3700 % and 3400 % , respectively ) , and interproximal plaque index scores ( 50.8 % and 52.5 % , respectively ) .