The Oral-B CrossAction Toothbrush Heads are designed with angled bristles to target plaque and leave your mouth feeling fresh. This pack contains 4 individual toothbrush heads and are compatible with all Oral-B handles except Pulsonic & iO. Oral-B Cross Action Toothbrush Heads feature angled bristles at 16 degrees that target plaque and remove up to 100% more plaque vs a manual toothbrush. The toothbrush heads are developed Clean Maximiser technology that turns green bristles yellow to indicate when the heads need changing for optimal performance. The bristles are designed to reach deep between the teeth to remove plaque and leave your mouth feeling clean. Compatible with all Oral-B handles excluding Pulsonic & iO. Key Features of Oral-B Cross Action Toothbrush Head Clean Maximiser technology turns bristles yellow for optimal brushing Targets plaque Reach deep between the teeth