The Oral B io series combines powerful, but gentle micro-vibrations with Oral B unique dentist-inspired round brush head design for a professional clean feeling every day. The Oral-B iO GENTLE Care brush is specially designed for gentle and effective cleaning on sensitive areas and gums. Dentists recommend changing your toothbrush head every 3 months For best resultsGentle care adapts precisely to the curvature of the tooth and gum line for a gentle and effective cleaning For gentle and effective cleaning on sensitive areas and gums The bristles are carefully arranged on the typical Oral-B round head to better surround each tooth for optimal cleaning Dentists recommend changing the brush every 3 months for optimal cleaning Exclusively designed and guaranteed for your Oral-B iO