Plaque reduction with 
PLAQUE
For evaluating the effect of longer brushing with the auto-cleaning device, we increased the brushing time per jaw from 5 to 15 s. Ten probands were willing to participate in this second part of the study (non-blinded, non-randomized). After 3 days of plaque accumulation, there was no statistically significant difference for pre-brushing RMNPI compared to the first part of the trial (median 59.65%; range 18.52–71.23%; 