COMPATIBLE ONLY WITH ORAL-B iO ELECTRIC TOOTHBRUSH HANDLES You Will Receive 2 Oral-B iO Gentle Care replacement brush heads iO technology Combines Oral-B unique round brush head with the gentle energy of micro-vibrations for synchronized cleaning action Oral-B iO's gentlest brushing experience Optimized bristle patterns adapt to the curves of the teeth and gums, but are extra soft for maximum comfort