The purpose of this investigation was to determine if statistically significant differences existed in the gingival health of subjects who brushed with a rotary electric toothbrush (Rota-dentR when compared to a conventional toothbrush (Oral B-35R). A randomized, two group research design was employed using forty subjects. At baseline and at two week intervals for six weeks, gingivitis and supragingival dental plaque were measured by the Loe and Silness Gingival Index and the O'Leary Plaque Index,...