The efficacy of manual toothbrushes following a brushing exercise: a systematic review

The efficacy in plaque removal following a brushing exercise is a reduction from baseline plaque scores of 42% on average, with a variation of 30–53% dependent on the plaque index used. The available evidence indicates that bristle tuft arrangement ( improvement in efficacy can be
achieved with a multilevel bristle tuft configuration as compared to the traditional flat trim, and a brush with
an angled bristle tuft configuration is significantly more effective ) and brushing duration are factors that contribute to this variation in observed efficacy.