Oral B Crossaction Toothbrush Heads Black 2 per packOral Bs best for whole mouth cleaning (excluding Oral B iO), Up to 100% more plaque removal and healthier gums vs. a regular manual toothbrush, With Clean Maximizer technology, green bristles turn yellow when it is time to replace your brush head, Perfectly angled at 16 degrees to reach deep between teeth and sweep away plaque, Dentists recommend to change brush head every 3 months for the best clean, Compatible with all Oral B handles except Pulsonic