Oral B Crossaction Toothbrush Heads Black 4 per packAs one of Oral B's premium replacement toothbrush heads, the Black Cross Action features precise angles that targets plaque to remove up to 100% more plaque vs. a regular manual toothbrush. The shape of Oral B's Cross Action toothbrush head features specifically engineered bristles that are designed for optimal tooth coverage. The unique bristles reach deep between teeth to remove plaque and leave your whole mouth cleaner than a regular manual