Fully Compatible - The toothbrush replacement heads are compatible with Philips Sonicare toothbrush heads electric handles.premium internal components ensure perfect operation, every time. Exceptional Cleaning - High quality Densely-Packed bristles of replacement toothbrush heads remove up to 7X plaque versus a manual toothbrush, reminder bristles that fade to let you know when it's time to replace. Target Stubborn Plaque - Replacement brush heads with special contoured bristles, fit naturally to the shape of your teeth and easily remove plaque in hard-to-reach areas. Care For Gums-The End-rounded, US DuPont Bristles are gentle enough to prevent bleeding on gums. Enjoy a comfortable brushing experience every time!