Remove up to 2x more plaque than a manual toothbrush: this brush head's contoured bristles and W-profile are designed to fit the shape of your teeth naturally to provide more efficient cleaning Proven Sonicare technology cleans gently yet effectively with up to 62,000 bristle movements; dynamic fluid action supports cleaning by driving fluid deep between teeth and along the gumline Proven to deliver effective oral care: Philips Sonicare replacement toothbrush heads are meticulously designed and clinically tested; they meet the highest standard in quality, safety and performance Click-on design: Philips Sonicare C1 ProResults brush heads fit all Philips Sonicare handles⁴ You'll know when it's time to change the brush head thanks to BrushSync replacement reminder (compatible handles) that tracks how often and how hard you brush, and when blue bristles turn white 70% of the plastic in this brush head is bio-based²; paper-based recyclable packaging³ The set includes: 4x C1 ProResults brush heads, white