Teeth with yellow tartar is often caused by tartar accumulation pigmentation, clinical often use gingival scaling method to remove, divided into manual scaling and ultrasonic scaling. 1. Manual scaling. Manual scaling is the use of manual scaling instruments, the use of wrist force to scrape the teeth on the surface of the tartar soft tartar, with a modified grip pen type will work on the edge of the instrument on the root of the tartar, close to the surface of the teeth at about eighty degrees, wrist force, the tartar from the surface of the teeth scraped down. 2. Ultrasonic cleaning. Ultrasonic cleaning utilizes ultrasonic vibration to remove tartar by placing the tip of the instrument on the surface of the tooth and vibrating it. It is more efficient and saves time and labor compared to hand instruments. After removing the tartar pigment on the tooth surface, the tooth surface can also be polished to reduce the pigmentation.