The Oral-B iO Gentle Care Replacement Brush Heads are designed exclusively for Oral-B iO toothbrush handles. for clean, sparkling teeth. Since you should change your brush head every 3 months, Oral-B replacement brush heads feature colored bristles to help you know when it’s time to change your brush head. Oral-B Gentle Care iO brush heads are micro-thin yet soft with a unique, dentist-approved round head. Designed for Oral-B iO toothbrushes, Gentle Care brush heads remove up to 100% more plaque than a standard toothbrush. Improve your oral hygiene with Oral-B iO Replacement Brush Heads. Get a healthier smile with every brush!