The Oral-B iO Series Ultimate Clean Replacement Brush Heads combine powerful but gentle micro-vibrations with our unique, dentist-inspired round brush head design for a professional clean feeling every day. Designed exclusively for Oral-B iO electric toothbrush handles, the Ultimate Clean brush heads help remove up to 100% more plaque than a regular, manual toothbrush, leaving teeth feeling clean and bright. Precisely angled at 16 degrees, tufted bristles help clean hard-to-reach areas of the mouth. Since dentists recommend changing your toothbrush head every 3 months for best results, Oral-B replacement brush heads feature color-changing bristles that signal when it's time for a change by fading to white.