Achieve better plaque removal than with a manual toothbrush thanks to the Philips Sonicare 1100 Series sonic toothbrush paired with the C1 Simply Clean electric toothbrush head. Enjoy a powerful yet gentle clean, even in those hard-to-reach areas. The Advanced Sonic Technology provides gentle yet effective cleaning, pulsing fluid between teeth and along the gumline. To help you get used to the Sonicare experience, the EasyStart feature adjusts the power level of the toothbrush over the first 14 uses. Improve your brushing technique with QuadPacer, which reminds you to brush each section of your mouth for 30 seconds, and reach your recommended brushing time of 2 minutes with SmarTimer. Experience up to 14 days of regular brushing after a single charge, bringing a new level of convenience to your brushing routine (based on two periods of two-minute brushings per day on standard mode). Dental professionals recommend changing brush heads every 3 months.