Oral-B Floss Action Toothbrush Heads 4 per packAs one of Oral Bs 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 Bs 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