Whiter, healthier smile: the Philips Sonicare 4100 electric toothbrush for adults helps whiten teeth every time you brush and includes our W2 Optimal White brush head Unique sonic technology: get a powerful yet gentle clean with bristle vibrations that drive microbubbles deep between teeth, giving you two months' worth of manual brushing in just 2 minutes** Protects your gums: our built-in pressure sensor helps protect your teeth and gums by warning you that you are pressing too hard so you can reduce your pressure Sensitive cleaning: make brushing more comfortable for your own teeth and gums by customising your brushing by selecting between 2 modes: Clean or Sensitive Complete clean: use the built-in 2 minute SmartTimer and 30 second QuadPacer to get a guided and complete clean when brushing your teeth for the recommended time