The Ultrasonex rechargeable toothbrush supercharges your dental hygiene routine, removing far more plaque than even the most manic manual brushing could achieve. Alternating 1.6 MHz ultrasonic and 18,000 SPM carrier waves, the "dual frequency" action purports to reach below the gum line to prevent gingivitis and bleeding. (More likely, it's the 18,000 strokes per minute that does the trick.) It's certainly true that the Ultrasonex leaves teeth as clean as they'll feel short of a trip to the dentist.