Theproduct is mainly used for teeth cleaning and is also an indispensable equipment for teeth disease prevention and treatment. The product D1 ultrasonic scaler has scaling, perio functions. It contains the following features: 1. Automatic frequency tracking ensures that the machine always works on the best frequency and performs more steadily. FDA Statement: The sale of this item may be subject to regulation by the U. Food and Drug Administration and state and local regulatory agencies.