Superior plaque removal (clinically proven to remove more plaque than a regular manual brush). The brand more dentists use themselves worldwide. Why is CrossAction right for you? It's clinically proven to remove more plaque than a regular manual brush. It removes up to 90% of hard to reach plaque (one time brushing studies). How does CrossAction work? It combines: CrissCross Bristles: Unique CrissCross bristles are angled in opposing directions to lift out and sweep away plaque; Power Tip Bristles: Extra long bristles help clean hard to reach places; Indicator Bristles: Blue Indicator bristles fade halfway so you know when to replace your brush. Dentists recommend changing your brush every 3 months. A new toothbrush can remove up to 30% more plaque than one 3 months old (research with a flat trim manual toothbrush).