Oral-B Pro Cross Action is equipped with 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 feature new X-shaped bristles that clean areas inaccessible to rounded bristles. The bristles change from green to yellow, reminding you to replace the brush head to maintain optimal cleaning effectiveness. Guaranteed compatibility with all rechargeable Oral-B electric toothbrushes except for Pulsonic and iO toothbrushes.