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