Designed especially for children 7 to 10 years old, Philips Sonicare for Kids toothbrush heads encourages healthy brushing habits and deliver outstanding results. These age-appropriate brush heads have rubber molding to protect children's sensitive teeth. Their soft bristles are designed especially for smaller teeth and developing gums. The Sonicare for Kids brush heads snap on and off for easy cleaning and come in two bright colors. For best results, a new brush head is recommended every three months.