Ultrasonic toothbrush to remove dental calculus HT08

Product Features: The product uses ultrasonic technology, and the product itself does not vibrate after it is turned on. You need to install the cleaning head and tighten the cleaning head with a small wrench. The product will only work when it contacts hard objects such as wrenches and teeth, and will make a buzzing sound, indicating that the product is vibrating. There is no sound or vibration when the product contacts soft objects such as skin and gums, which can effectively protect the gums.