1. Kindly needs to be connected to the power supply before operation.
2. Plug in the power to turn it on, if the indicator light is on, it means it is turned on
3. Select the appropriate work tip (the work tip should be tightened with a small wrench), then it can be operated on the teeth when installed (slightly use a little force on the calculus when operating)
Note: after starting up, it will not produce ultrasonic waves against the air; contact with teeth, ceramic metal or glass will produce ultrasonic vibration