Philips Sonicare DiamondClean Smart 9400

If you care about cavity prevention, whiter teeth and healthier gums and you’re tired of guessing whether you brush properly, this app‑connected sonic brush turns vague good intentions into measurable habits. The DiamondClean Smart 9400 pairs Philips’ clinical claims (up to 20× more plaque removal vs a manual brush and up to 15× healthier gums in six weeks) with live coaching, a pressure warning light and brush‑head tracking to close the gap between brushing and results. ## What makes it worth it The brush combines four cleaning modes and three intensity settings so you can tailor sessions for daily clean, gum care or whitening, and the handle’s light‑ring pressure sensor gives immediate, physical feedback when you press too hard. The Sonicare app records where and how long you brush and links that data to the included premium heads (A3 All‑in‑One and G3 Gum Care) so replacements and technique are tracked rather than guessed. The charging glass and USB travel case are thoughtful extras that make it easier to keep the brush charged and protected on the go. ## Where it falls short This is a top‑end toothbrush with a price to match, and if you’re primarily after simple one‑button brushing the app and connected features add complexity you may never use. The app experience is useful but matches, rather than dramatically exceeds, competing smart brushes from Oral‑B in coaching features. Buyers who want data‑driven, pressure‑aware brushing and regular reminders to replace heads should buy this; those who want a cheap, no‑frills electric brush should look at simpler Sonicare or Oral‑B models instead.

£199.99