The Oral-B FlossAction Replacement Electric Toothbrush Head provides a floss-like clean** for healthier gums. The round brush head is inspired by dental professional tools for a tooth-by-tooth clean, with specially engineered bristles. The FlossAction toothbrush head has unique floss action bristles to loosen plaque. Max Clean Bristles change from green to yellow to signal when to change your brush head to maximize your clean. **does not replace flossing.