The Philips Sonicare DiamondClean 9000 Twin Pack toothbrush is primarily designed for adults and not specifically for children.

- Recommendation for children: It is not recommended that an 8 year old child uses this toothbrush as it is optimised for adult needs and does not contain specific children's brushes or settings.

- Children's attachment brush: There is no compatibility with children's attachment brushes for the DiamondClean 9000 series. Children should use specially designed children's toothbrushes that are optimised for their needs.

It is advisable to choose a toothbrush specifically designed for children to ensure that it meets the child's needs and safety.