• Replacement brush heads designed exclusively for Oral-B iO electric toothbrush handles. • High-density filaments with up to 4000 soft bristles for a gentle and effective clean. • Its round head design adapts to the curvature of teeth to protect gums. • Helps remove up to 100% more bacterial plaque compared to a traditional manual toothbrush. • Features color-changing bristles to indicate the optimal time for head replacement. • Specially developed for sensitive gum care and a professional clean feeling.