New from Philips Sonicare. The HX9990 Prestige toothbrush brush learns and adapts to how you brush, for your most complete clean yet. Philips Sonicare 9900 prestige with sensor technology is our most advanced electric toothbrush. Sensing your every move and adapting to your needs in real time for exceptional care. As you brush, pressure, motion, coverage duration and frequency are monitored up to 100 times per second. The HX9990 then adapts automatically in real time for advanced teeth and gum Care. The intelligence of SenseIQ takes the guesswork out of brushing modes, so you can experience effortless care and better brushing over time.