DiamondClean Prestige 9900

If you brush twice a day but still worry about plaque, gum health and surface stains, a smart sonic toothbrush that senses how you brush and adapts in real time fixes the human problem — inconsistent technique. The Philips DiamondClean Prestige 9900 adds SenseIQ sensors and app coaching to routine brushing so you get consistently better coverage and gentler pressure without having to think about it. ## What makes it worth it SenseIQ is the headline: the handle senses pressure, motion and coverage and adapts intensity automatically while the app gives day/week/month progress and personalised tips, so you’re guided toward better technique rather than just watching stats. The 9900 packs five cleaning modes and three intensity levels (Clean, White+, Gum Health, Deep Clean, Sensitive) plus the premium A3 All‑in‑One brush head, which Philips bundles for a fuller, faster stain reduction; Philips quotes big clinical numbers (up to 20x plaque removal in hard-to-reach areas and visible stain reduction in days) and reviewers rank it among the top smart toothbrushes for cleaning performance. The package includes a USB-C travel charging case and a charging base so it’s genuinely convenient for travel. ## Where it falls short The biggest weakness is price: the 9900 and its replacement heads sit at the top of the market, so the real-world benefit over cheaper sonic brushes is incremental unless you use the coaching and premium heads regularly. Some users also find app setup and syncing fiddly compared with the instant simplicity of a non‑smart brush. Buy this if you want a premium, data‑driven clean that prevents over‑brushing and attacks stains with guided technique; skip it if you only want a simple, lower‑cost sonic toothbrush and won’t use the app or premium brush heads.

£229