There may be hazards such as gum damage, tooth sensitivity, bleeding, etc. after ultrasonic scaling, but the hazards may be minimal. 1. The potential harm of ultrasonic scaling is minimal, removing calculus and plaque to achieve excellent oral cleaning effect, generally no other harm. Scaling to remove tartar may damage the gums and expose the roots of the teeth due to strong ultrasonic waves, resulting in pain or even aggravate the symptoms of periodontal disease. 2. Very few patients may appear after scaling tooth sensitivity, mainly manifested in hot and cold reaction. 3. Patients with red and swollen gums before scaling may also have bleeding gums due to collision damage. If the above symptoms occur after scaling, it is recommended that the patient consult a doctor in time, through the internal oral examination to determine the location and severity of the damage, and follow the doctor’s instructions for the appropriate treatment.