Oral-B Precision Clean Power Electric Toothbrush Replacement Head: * Advanced bristles system: removes more plaque than a regular manual toothbrush * Interdentally tips: penetrate hard-to-reach areas * Indicator bristles: fade halfway to signal when to replace your brush head * Cleans deeper than a regular manual toothbrush * Penetrates hard-to-reach areas * Cleans Better 3X Longer vs. Store Brands after 13 weeks vs.4 weeks of comparable store brand use