The Oral-B Frozen Refills are designed to be used with the Oral-B frozen toothbrush for kids aged 3 years and above. These replacements round heads feature extra-soft bristles that are gentle on young gums, the smaller head makes it suitable for small mouths, and a unique round head to cup each tooth. Each toothbrush head displays the Disney characters your kids love. Works with the free Disney Magic Timer app, to motivate kids to brush for longer. Oral-B Oral B Frozen Refills EB10