Oral-B Pro Cross Action features over 2,200 angled bristles to remove up to 100% of bacterial plaque for cleaner teeth and healthier gums compared to a manual toothbrush. Authentic Oral-B brush heads are equipped with new X-shaped bristles that clean areas inaccessible to rounded bristles. The bristles change color from green to yellow to remind you to replace the brush head for optimal cleaning efficiency. Guaranteed compatibility with all rechargeable Oral-B electric toothbrushes except for Pulsonic and iO toothbrushes.