These Philips Sonicare for Kids toothbrush heads encourages healthy brushing habits and delivers outstanding results. These compact brush heads are designed for smaller mouths, ages 3-7, and have rubber molding to protect children's sensitive teeth. The soft bristles are designed for small teeth and developing gums. The Sonicare for Kids brush heads snaps on and off for easy cleaning. For best results, a new brush head is recommended every 3 months.