Oral-B Floss Action brush head features MicroPulse bristles that help provide a superior deep clean between teeth*. The bristles on the round brush head are designed to clean deep between teeth to remove up to 100% more plaque leaving your whole mouth cleaner than a regular manual toothbrush. The brush head is also equipped with colour-changing bristles that help you change your brush on time. The bristles turn from green to yellow, indicating when it is time to change. Features Soft MicroPulse bristles that reach between teeth for an interdental clean Indicator bristles turn from green to yellow to signal when it's time to change your brush head. Cleans deeper between teeth vs a regular manual toothbrush. Compatible with all Oral-B rechargeable handles (except iO Series/ Battery/Sonic brushes) Oral-B, #1 MOST USED TOOTHBRUSH BRAND BY DENTISTS WORLDWIDE**Most used by dentists based on surveys of a representative worldwide sample of dentists’ usage carried out for P&G continuously.