This brush head's contoured bristles and W-profile are designed to fit the shape of your teeth naturally and remove up to 200% more plaque than a manual toothbrush Proven Sonicare technology cleans gently yet effectively with up to 62,000 bristle movements; Sonicare Fluid Action supports cleaning by driving fluid deep between teeth and along the gumline All Philips Sonicare electric toothbrush replacement heads are meticulously designed and clinically tested: you can be sure they meet the highest standard in quality, safety and performance BrushSync replacement reminder⁵ tracks how often and how hard you brush; the light on the handle will turn on when it's time to replace your brush head, blue bristles will also turn white These sonic toothbrush replacement heads are compatible with all Philips Sonicare click-on electric toothbrushes²: simply click one on or off for easy replacement and cleaning Philips aims to reduce the use of fossil fuel-based plastic, that's why 70% of the plastic in these sonic toothbrush replacement heads is bio-based²; paper-based recyclable packaging³