The Sensitive Clean brush head features ultra-soft bristles that are particularly gentle on the gums. It removes up to 100% more plaque and reduces gum inflammation by up to 100% compared to a manual toothbrush. Oral-B's original brush heads have been designed with new X-shaped bristles that can now clean areas that regular bristles cannot reach. Dentists recommend changing the brush head every 3 months to ensure 100% cleaning power. Guaranteed compatibility with all Oral-B rechargeable toothbrushes, except for Pulsonic and iO.