Brush head bristles brush away plaque for a superior tooth-by-tooth clean | X-shape bristles clean in areas that round ones cannot reach | Brush head usage indicator turns bristles from green to yellow showing you when to change for 100% cleaning efficacy | Guaranteed fit with Oral-B electric rechargeable toothbrushes except Pulsonic & iO toothbrushes | Removes up to 100% more bacterial plaque for cleaner teeth and healthier gums vs. a manual toothbrush