Ultimate Clean combines Oral-Bs perfect angle, with innovative new bristles, for Oral-Bs best cleanFor up to 100% plaque removal as of day 1On Oral-Bs signature round brush head, bristles are meticulously arranged to best surround each tooth for the best possible cleanDentists recommend to change brush head every 3 months for the best cleanDesigned exclusively for and guaranteed to fit your Oral-B iONumber of toothbrush heads included in this pack: 4Choose Oral-B, #1 used by dentists worldwide Oral B Oral-B iO Ultimate Clean Toothbrush Heads, Pack of 4 Counts in Clear