The Oral-B iO Ultimate Clean electric toothbrush heads are especially designed for an effective clean, for up to 100% plaque removal as of day 1.Ultimate Clean combines Oral-Bu0027s perfect angle with innovative new bristles for Oral-Bu0027s best cleanFor up to 100% plaque removal as of day 1On Oral-Bs signature round brush headbristles are meticulously arranged to surround each tooth for the best possible cleanDentists recommend changing the 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: 4