Replacement toothbrush heads for black Oral-B brushes Up to 100% more plaque removal compared to standard brush heads Bristles turn from green to yellow when they need to be replaced Rounded brush head design to ensure that the whole tooth is cleaned Designed by dentists for optimal brushing Angled bristles to get to those hard-to-reach areas Compatible with all Oral-B brushes except Pulsonic and iO Say hello to healthier gums and fresher mouths with these premium replacement brush heads. More effective at removing plaque than a manual toothbrush, Oral-B\'s Cross Action heads have been designed with angled bristles at 16 degrees to clean all around the teeth, and in between. Dentist-approved, these brush heads will also let you know when it\'s time to replace them. The bristles turn from green to yellow, thanks to CleanMaximiser technology. Oral-B Cross Action Black Power Toothbrush Refill Heads, pack of 8