· SUPERIOR PLAQUE REMOVAL: Perfectly angled electric toothbrush replacement brush heads to remove up to 100% more plaque vs. a regular manual toothbrush.· PROFESSIONALLY INSPIRED DESIGN: Oral-B iO's round toothbrush head is inspired by dental professional tools for a tooth-by-tooth clean, with specially engineered bristles for optimal tooth coverage.· COLOR-CHANGING BRISTLES: Color-Changing Bristles change colors to signal when to change your electric toothbrush replacement brush heads to maximize your clean· TRUSTED BY DENTISTS: Oral-B is the #1 Dentist Recommended Toothbrush Brand Worldwide.· COMPATIBILITY: Pack includes 2 Genuine Oral-B iO Ultimate Clean replacement toothbrush heads, compatible with the Oral-B iO Series rechargeable toothbrush handles, and not compatible with Oral-B Pro, Smart, and Genius electric toothbrush handles.