Oral-B Sonic Refils (3 count), SR18-3... Oral-B Sonic replacement rechargeable toothbrush head offers sonic technology to remove plaque and surface stains effectively and naturally. Features CrissCross bristles, angles in opposing directions to reach between teeth. The Oral-B Sonic brush head fits the following rechargeable electric toothbrush models: Oral-B Sonic Complete, Oral-B Vitality Sonic.