The Philips Sonicare DiamondClean 9000 is primarily designed for adults and older children who are already familiar with an electric toothbrush. However, it may be suitable for an 8-year-old child under certain conditions.

- Recommendation: It is advisable to read the manufacturer's instructions and recommendations carefully before use by a child. Philips offers special children's toothbrushes and attachments that are better adapted to the needs of children.
- Children's toothbrush attachment: There are no specific children's toothbrush attachments designed specifically for the DiamondClean 9000. It is often better for children to use a toothbrush that is specially designed for their age and needs.

It is therefore advisable to choose an electric toothbrush that has been specially developed for children to ensure the best oral hygiene and ease of use.