The sodium hypochlorite rinse group and the water rinse group , respectively , showed increases from baseline to 3mo of 94 % and 29 % ( 3.2-fold difference ) in plaque-free facial surfaces , of 195 % and 30 % ( 6.5-fold difference ) in plaque-free lingual surfaces , and of 421 % and 29 % ( 14.5-fold difference ) in number of teeth with no bleeding on probing .