Oral-B Kids Frozen Electric Toothbrush Heads feature extra soft bristles, specifically designed to be gentle for children aged 3 and above. These replacement brushes have a round brush head, sized for small mouths and are gentle on gums. Dentists recommend changing brush heads every 3 months for optimal cleaning efficacy. These are compatible with all Oral-B Pro Kids electric toothbrushes. Oral-B is the #1 brand most used by dentists worldwide, offering clinically proven results. This pack contains 8 brush heads.