EFFECTIVE CLEANING: Provides a more thorough clean, removing Up to 100 Percent more bacterial plaque for cleaner teeth and healthier gums than a manual toothbrush when used with Oral B electric toothbrush heads UNIQUE X-SHAPE BRISTLES: Only genuine Oral B electric toothbrush heads feature x-shape bristles that clean in areas that regular ones cannot reach for optimal cleaning efficacy DEEP CLEANING: The Oral B toothbrush head cross action features unique 16 degree angled bristles to perfectly adapt to each tooth for deep cleaning COMPATIBILITY: Guaranteed fit with Oral B toothbrush heads' electric rechargeable toothbrushes except Pulsonic and iO toothbrushes USAGE INDICATOR: Brush head usage indicator - bristles turn from green to yellow reminding you when to change your Oral B sensitive toothbrush heads to maintain optimal cleaning efficacy