For up to 100% more plaque removal with superior clinical results vs a manual toothbrush Oral-B iO Ultimate Clean features " tuft-in-tuft " bristles structure with 16-degree angle to reach deeper in between teeth iO Technology combines Oral-B's iconic round brush heads with the gentle micro-vibrations of iO toothbrush for Oral-B's best cleaning performance Oral-B iO brush heads are exclusively designed to fit Oral-B iO toothbrushes Dentists recommend changing brush head every 3 months to keep an optimal cleaning efficacy Oral-B is #1 brand most used by dentists worldwide. Perfect angle The Ultimate Clean refill features Oral-B's perfectly angled bristles (16°) to deliver better cleaning along the gumline. Tuft-in-tuft Longer, thinner inner bristles target hard-to-reach areas. Shorter, wider bristles provide thorough surface cleaning. Replace regularly Change brush head when the iO toothbrush notifies you, to get back to 100% cleaning efficacy. The Oral-B iO Ultimate Clean Toothbrush Head is 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. Dentists recommend to change brush head every 3 months for the best clean. Only compatible with Oral-B iO.