The sonic Tooth Cleaner can effectively separate dental plaque, dental calculus, and stains, removes hard tartar easily from the teeth preventing gum disease.It has a smart memory function, which automatically selects the last shutdown mode when it is opened.5 Grades of adjustable frequency to remove stubborn calculus, tartar and teeth stain. Automatic outage after fully charged, auto-protective and energy saving.Ultrasonic technology, 30000 times per minute high-intensity frequency, effectively smash the stubborn calculus, reduce the damages to the enamel and gum, which may be caused by manual dental tools.Safe and fast charging way by USB. Charging once can be used about 200 times, travel without worrying about power loss.