The Oral-B iO ultimate cleaning brush heads combine powerful but gentle micro-vibrations with unique, dentist-inspired round brush heads for a professional cleaning experience every day. Designed exclusively for Oral-B iO electric toothbrushes, the ultimate cleaning brush heads help remove up to 100% more plaque than a conventional manual toothbrush, leaving teeth clean and bright. Precisely angled at 16 degrees, the bundled bristles help to clean hard-to-reach areas of the mouth. As dentists recommend changing the brush head every 3 months for results, Oral-B replacement brush heads feature colour-changing bristles that signal when it's time for a change.