The Oral-B iO Series combines powerful, but gentle micro-vibrations with Oral-B’s unique dentist-inspired round brush head design for a professional clean feeling every day. Ultimate Clean Refills help remove plaque, leaving teeth feeling clean and bright. Tufted bristles help clean hard-to-reach areas of the mouth. Dentists recommend changing your brush head every 3 months for best results. Combines Oral-B’s unique round brush head with gentle micro-vibrations for a surprisingly enjoyable experience and healthy teeth and gums for life Reduces plaque build-up along the gumline The dual-length bristles surround and reach deep in-between teeth and have higher density for an ultimate clean Compatible with Oral-B iO Electric Toothbrush Handles Dentists recommend changing your brush head every 3 months What's in the box?