• Oral-B iO Gentle Cleansing replacement heads specifically designed for effective and gentle cleaning on sensitive gums. • Combine powerful micro-vibrations with the exclusive dentist-inspired round head for a professional cleaning sensation. • Features 4000 soft bristles and a cushioned outer ring that precisely adapts to the curvature of the teeth. • Includes bristle technology that changes color to indicate the optimal replacement time every 3 months. • Removes up to 100 percent more bacterial plaque compared to a conventional manual toothbrush. • Designed exclusively to be compatible with Oral-B iO series electric toothbrushes.