Fig. 4From: A randomised clinical trial to evaluate the effect of a 67 % sodium bicarbonate-containing dentifrice on 0.2 % chlorhexidine digluconate mouthwash tooth stainingMean Overall MLSI score by treatment, study site (centre) and time (unadjusted means ± standard error). BL = Baseline; PROPHY = Prophylaxis; MW = Mouthwash; MLSI = modified Lobene Stain IndexBack to article page