Removes up to 10x more plaque for a deep clean Know you're getting the deepest possible clean with The C3 Premium Plaque Control brush head. The soft, flexible bristles are designed to curve around the contours of your teeth, giving you 4x more surface contact and up to 10x more plaque removal from hard-to-reach spots. Hard on plaque, gentle on your gums The C3 Premium Plaque Control brush head is designed to give you your deepest clean yet. Soft flexible sides and bristles perfectly curve around the contours of your teeth, giving you 4x more surface contact and helping target hard-to-reach spots. Start and keep up healthy habits The DiamondClean 9000 gives you the guidance you need to improve and maintain healthy brushing habits in between dentist checkups. Built-in smart sensors let you know when you're using too much pressure, and by connecting your brushing experience to the Sonicare app, a personalized Progress Report helps you stay on track, to see how much you've improved over time.