The Oral-B Pro Floss Action Replacement electric toothbrush head features specifically engineered MicroPulse bristles that loosen plaque to remove up to 100% more plaque vs. a regular manual toothbrush. Oral-B genuine brush heads are designed with new X-shape bristles that clean in areas that round ones cannot reach. Its 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.