Oral-B Floss Action Replacement Brush Heads - 4 HeadsOral B Floss Action Replacement Brush Heads 4 Heads The Oral B Floss Action brush head features MicroPulse bristles that help provide a deep clean between teeth. The bristles on the professionally inspired round brush head are designed to clean deep between teeth to remove up to 100% more plaque than a regular manual toothbrush when used with an Oral B electric toothbrush. MicroPulse bristles provide high quality deep clean between teeth.