Removes up to 100% more bacterial plaque for cleaner teeth and healthier gums vs. a manual toothbrush. Only genuine Oral-B brush heads feature X-shape bristles that clean in areas that regular ones cannot reach for optimal cleaning efficacy. Oral-B Floss Action features unique interdental bristles to reach deep between teeth and sweep away plaque. Guaranteed fit with Oral-B electric rechargeable toothbrushes except Pulsonic and iO toothbrushes. Brush head usage indicator: bristles turn from green to yellow reminding you when to change to keep 100% cleaning efficacy. Oral-B is #1 brand most used by dentists worldwide with clinically proven results.