90% deeper reach removes plaque between teeth. Clinically proven to remove more plaque than a regular manual brush. It removes up to 90% of hard to reach plaque.* CrossAction Bristles: Unique CrissCross bristles are angled in opposing directions to lift out and sweep away plaque. PowerTip Bristles: extra long bristles to help clean hard to reach places. Indicator Bristles: Blue Indicator bristles fade halfway so you know when to replace your brush. *One time brushing studies.