The Oral-B iO Ultimate Clean replacement brush heads combine powerful yet gentle micro-vibrations with a unique dentist-inspired round brush head for a professional cleaning feel every day. Exclusively designed for Oral-B iO electric toothbrushes, the Ultimate Clean brush heads help remove up to 100% more plaque than a traditional manual toothbrush, leaving teeth looking clean and bright. Precisely angled at 16 degrees, the clustered bristles help clean hard-to-reach areas in the mouth. Since dentists recommend replacing the brush 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. Superior cleaning power with the only replacement brush heads that are exclusively and guaranteed to fit the Oral-B iO electric toothbrush.