The Philips Sonicare Power Flosser 7000 Oral Irrigator & Power Toothbrush System HX3921/40 is up to 180% more effective and provides healthier gums than manual flossing alone. It utilizes Quad Stream technology for faster, more effective and thorough cleaning. Whisper quiet operation ensures great results without disturbing others. It features 4 flossing modes and 10 intensities. The X-shaped stream of water reaches deep between teeth for a gentle, thorough clean. Power toothbrush has 3 modes including clean, gum health and deep clean+.