Oral-B Crossaction Electric Toothbrush Heads X8. Features angled bristles for a comprehensive clean. Various bristles levels. Cross Action heads are designed to reach deep. Perfectly angled to reach deep between teeth,Bristles clean tooth by tooth to help remove up to 100% plaque,Indicator bristles fade as a sign to replace your toothbrush head for a better clean,Compatible with the entire lineup of Oral-B electric toothbrushes, except for Oral-B sonic toothbrushes,Oral-B #1 brand used by dentists worldwide