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. 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. Enjoy superior cleaning power with the only refill brush heads designed exclusively for and guaranteed to fit your Oral-B iO electric toothbrush. The Oral-B iO Ultimate Clean replacement electric toothbrush heads are especially designed for an effective clean, for up to 100% plaque removal as of day 1. Ultimate Clean combines Oral-B's perfect angle with innovative new bristles for Oral-B's best clean. On Oral-B's signature round brush head bristles are meticulously arranged to best surround each tooth for the best possible clean. Designed exclusively for and guaranteed to fit your Oral-B iO. Number of toothbrush heads included in this pack: 4. Choose Oral-B, 1 used by dentists worldwide.