The Oral-B iO Ultimate Clean replacement toothbrush heads are especially designed for an effective clean, for up to 100% plaque removal as of day 1. Ultimate Clean combines Oral-Bs perfect angle, with innovative new bristles, for Oral-Bs best clean For up to 100% plaque removal as of day 1 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 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