The Philips Sonicare C2 Optimal Plaque Defence toothbrush head (formerly ProResults plaque control) is perfect for those who want to maintain optimal plaque removal as part of their everyday oral healthcare routine. Densely-packed, high-quality bristles remove up to 7 x more plaque than a manual toothbrush. And the specially curved power tip makes reaching the teeth at the back of your mouth a breeze. Brush heads become less effective after 3 months' use, but with BrushSync™ you'll be reminded before this happens. Your smart toothbrush will track how often and how hard you brush and will notify you when it's time for a replacement. Don't have a smart Philips Sonicare toothbrush? Just monitor your blue replacement bristles — when they turn white you'll know it's time for a fresh brush head. Philips Sonicare's advanced sonic technology pulses water between your teeth, and its brush strokes break plaque up and sweep it away for an exceptional daily clean. All Philips Sonicare brush heads are safe and gentle on teeth and gums. During tests, each brush head is put through its paces to ensure durability and an exceptional performance every time you brush. Your Optimal Plaque Defence brush head fits perfectly with any Philips Sonicare toothbrush handle, except Philips One and Essence. Simply click on and off for easy replacement and cleaning.