The smaller brush head with special bristles is adapted to the small teeth of a child and provides a very gentle cleaning. The brush bristles are specially designed for children. The shorter bristles gently remove plaque, while the row of longer bristles in the middle of the head is ideal for cleaning the chewing surfaces of the teeth. Suitable for Oral-B Vitality, PRO, Smart and Genius toothbrushes. NOT SUITABLE for Oral-B iO and Pulsonic toothbrushes .