The Philips Sonicare HX9917/89 is a high-performance electric toothbrush from the DiamondClean Smart 9400 series, designed to provide a professional clean at home. It utilizes sonic technology to create 62,000 movements per minute, which helps break up plaque more effectively than manual brushing. To suit different oral needs, you can choose between five cleaning modes—Clean, White+, Gum Health, Deep Clean+, and Sensitive—and further customize the experience using three distinct intensity levels. This black handle features a visual light ring at the base that acts as a pressure sensor, alerting you if you press too hard to protect your gums. For those who want to refine their technique, Bluetooth connectivity allows the brush to sync with the Philips Sonicare app, providing real-time feedback and tracking your progress over time. The device also includes integrated timers for both zone changes and the final cleaning cycle, alongside a sensor that reminds you when it is time to replace the brush head based on your actual usage. The set comes equipped with two brush heads, including the A3 Premium All-in-One designed to remove significantly more plaque. For power, the Li-ion rechargeable battery lasts up to 14 days on a single charge, which takes about 24 hours to complete. The package is rounded out with a charging glass and a USB charging travel case, making it a practical choice for adults who travel frequently but want to maintain a rigorous dental routine.