These Oral-B EB10-2 replacement brush heads feature a Disney Frozen II theme to make daily brushing more engaging for children aged three and up. The round head design is paired with extra-soft bristles that are gentle on young gums, while longer blue bristles specifically help clean the chewing surfaces of the teeth. Each pack contains two white brush heads designed for use with Oral-B powered toothbrush handles. To maintain effective cleaning, you should replace the head every three months. Please note that these are not compatible with Pulsonic, iO, Cross Action Power, Sonic Complete, or Vitality Sonic models.