The patient’s teeth have black tartar, and the removal methods include ultrasonic scaling, emery bar friction, sandblasting and pressure, smooth car needle friction, etc., as follows: I. Ultrasonic scaling: The patient applies ultrasonic scaling to remove the melanin deposited on the smooth tooth surfaces such as the lip and tongue surfaces. As the high frequency vibration of ultrasonic waves will leave slight scratches in the enamel layer, it is better to polish after scaling to prevent the redeposition of exogenous pigments. It is important to try to control smoking and drink less overly strong tea to slow down the rate of melanin formation. Second, emery strip friction: The black tartar formed on the adjacent surfaces of the patient’s teeth can be removed by repeated friction with emery strips. Third, sandblasting and pressure: the melanin in the patient’s jaw fossa point gap and other places can be removed by pressure under sandblasting. IV. Smooth car needle friction: When black-brown plaque is formed on the surface of the patient’s teeth, it can be removed by applying smooth car needle friction and applying fluoride-containing drugs to enhance the hardness of the enamel.