Oral-B Floss Action replacement heads provide superior, all-round oral hygiene. Their bristles clean the surface of your teeth, while specially designed MicroPulse bristles reach deeper and clean even the hard-to-reach spaces between your teeth. With CleanMaximiser technology, the indicator bristles gradually lighten to let you know when it's time to replace your head. They remove 100% more plaque than a manual toothbrush.