Oral B Power Toothbrush iO Advanced Clean Refills Black 8 Pack[GENUINE] The Oral B iO series combines powerful, but gentle micropulsations with Oral B unique dentist inspired round brush head design for a professional clean feeling every day. Oral B iO Advanced Clean Refill Brush Head has a unique 'Tuft in Tuft' structure, to reach deeper in between teeth and removes up to 100% more plaque along the gum line for cleaner teeth*. Designed with colour changing bristle technology that fades to white to signal when