Specially Designed for Dual Action Cleaning Both brush heads move for twice the cleaning action*. #1 Dentist Recommended Toothbrush Brand Worldwide Oral-B. Indicator bristles signal time to replace brush head. Dentists recommend changing your brush every 3 months. Interchangeable brush head: Floss Action, Pro White, Precision Clean, Sensitive Gum Care, Dual Clean. Does not fit: Vitality Sonic, Sonic Complete, Pulsonic, CrossAction Power. *vs. a regular manual toothbrush.