Overview
- The DiamondClean 9900 Prestige went on sale in the U.S. and Europe on Sept. 28 and is listed at $379.99 on retailers including Amazon.
- Philips built SenseIQ on‑device AI into the handle to monitor pressure, motion and coverage up to 100 times per second and to automatically reduce vibration if you brush too hard.
- The handle includes a touchscreen, a 12‑segment mouth map and a color light ring that work with a companion app to give real‑time coaching, coverage guidance and brushing history.
- Philips markets large efficacy gains — including claims of up to 2,000% more plaque removal and 1,500% gum improvement over six weeks versus manual brushing — but those figures are company claims and have not been independently verified in current coverage.
- Philips positions the 9900 Prestige as a luxury product with a glass charger, travel case charger, more sustainable brush‑head materials and improved repairability, UK coverage lists a £599.99 price, and a wider global rollout is planned for 2027.