Compatibility: Our replacement heads are completely well suited with Oral iO3/iO4/iO5/iO6/iO7/iO8/iO9/iO10 Series Electric Toothbrushes Replace your brush head each 3 months as recommended by way of means of dentists Made with wonderful US DuPont bristles that are durable, completely satisfied to gum, and have improved indicator bristles that remind you when to interchange your brush head. Remove extra enamel stains with the multi-directional double-headed toothbrush head which will clean from varied angles and adapt in your teeth shape. Enjoy a deep and thorough cleansing with the rotating powerhead and Soft bristles that reach deep between tooth and sweep away plaque.