The Oral-B FlossAction electric toothbrush replacement head provides a clinically proven 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. Max Clean Bristles change from green to yellow to signal when to change your brush head to maximize your clean. Dentists recommend changing your brush head every 3 months. *does not replace flossing