As one of Oral-B's premium replacement toothbrush heads, the FlossAction features specifically engineered MicroPulse bristles that loosen plaque to remove up to 100 more plaque vs. a regular manual toothbrush. Oral-B's improved FlossAction toothbrush heads are developed with CleanMaximiser technology that turns green bristles yellow for optimal brush head performance and the best clean. The unique round brush head and bristles reach deep between teeth for optimal tooth coverage. Compatible with all Oral-B handles except Pulsonic iO.