Oral-B iO Specialised Cleaning Electric Toothbrush Heads White - 2 Pack. Designed together with dentists to better clean braces, implants or crooked teeth. Precisely shaped outer bristles support the middle bristles to reach hard to reach areas. The iO technology combines the unique, round brush head with gentle micro-vibrations of the iO toothbrush for the best cleaning performance of Oral-B. Only compatible with Oral-B iO electric toothbrushes. Dentists recommend changing the brush head every 3 months for optimal cleaning performance.