As one of Oral-B’s premium replacement toothbrush heads, the Floss Action features specifically engineered Micro Pulse bristles that loosen plaque to remove up to 100% more plaque vs. a regular manual toothbrush. Oral-B’s improved Floss Action toothbrush heads are developed with Clean Maximizer 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. Removes up to 100% more bacterial plaque in hard-to-reach areas for cleaner teeth and healthier gums vs. a manual toothbrush, Oral-B Floss Action features unique interdental bristles to reach deep between teeth and sweep away plaque, Compatible with Oral-B electric rechargeable toothbrushes at exception of Pulsonic & iO toothbrushes, Brush head replacement indicator: bristles go from green to yellow based on individual usages reminding you when to change to keep 100% cleaning efficacy, Only genuine Oral-B brush heads are designed to guarantee 100% fit with your Oral-B toothbrush and best cleaning efficacy up to 160+ brushing sessions, Pack includes 4 genuine Oral-B Floss Action round brush heads, Oral-B is no.1 brand most used by dentists worldwide. Clinically proven results.