Fig. 2. The effect of toothbrush head size on dental plaque removal. (A) Acquisition of dental plaque images on tooth surfaces using a quantitative light-induced fluorescence digital (QLF-D) charge-coupled device camera (n=15/group). (B) Graph comparing the degree of dental plaque removal achieved with regular-sized and large-head toothbrushes using AREA R30 values from QLF-D images analyzed with QA2 software. (C) Graph comparing plaque index (PI) scores of regular-sized and large-head toothbrushes. The results are expressed as the mean±standard deviation. p-value was determined using the Wilcoxon signed-rank test.