The Oral-B replacement toothbrush head with extra-soft bristles is designed for sensitive teeth and gums. This adjustable head has a flexible grip to reach every nook and cranny of your mouth for thorough brushing. An indicator on the bristles lets you know when its time to change the refill head. Each pack has 3 electric toothbrush heads compatible with toothbrushes from Oral-B ProfessionalCare, Vitality and Pro-Health series. Ages 3 and up.