As one of Oral-B's refill brush heads in the premium segment, the FlossAction brush head has specially developed MicroPulse bristles that dissolve plaque and remove up to 100% more plaque compared to a standard manual toothbrush Oral-B's improved FlossAction toothbrush heads are developed with CleanMaximiser technology that causes the bristles to change color from green to yellow when it's time to replace the brush head for optimal brush head performance and the best cleaning possible. The unique, round brush head and bristles reach deep between the teeth for optimal tooth coverage. Fits all Oral-B handles, except Pulsonic and iO. • Oral -B's best for deep cleaning between teeth (except Oral-B iO) • Removes up to 100% more plaque for healthier gums compared to a regular manual toothbrush • With CleanMaximiser technology that makes the bristles change color from green to yellow when it's time to replace the brush head • With MicroPulse bristles that dissolve plaque and offer optimal tooth coverage • Replace every 3 months for best cleaning