Philips Sonicare C2 Plaque Control brush head's power tip is designed to target plaque in hard-to-reach areas; these electric toothbrush heads remove up to 700% 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 reminder⁴ 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 toothbrushes¹: 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