Yellow scale on teeth refers to the soft scale, plaque and calculus on the surface of teeth, which can be removed by patients through improving living habits, physical therapy and medication. 1. Soft scale: it is a soft and sticky deposit attached to the tooth surface, restoration surface, tartar and gingival margin. It consists of food debris and bacteria, and is white, light yellow or light gray in color. It can usually be removed by brushing the patient’s teeth daily. Mouthwash can also be used daily after brushing, which is conducive to oral cleansing. 2. Plaque: It is a soft and unmineralized bacterial group that adheres to each other wrapped in substrate or adheres to the surface of teeth, interdental or restorations. It can be treated with chlorhexidine mouthwash, which can effectively inhibit the bacteria in the oral cavity, thus achieving the purpose of removing dental plaque. 3. Calculus: It is plaque and soft scale deposited on the surface of teeth or restorations that have been calcified or are being calcified. Ultrasonic treatment can be performed to remove the yellowish-brown plaque attached to the teeth directly by using high-frequency oscillation. It is recommended that patients with yellowish tartar on teeth go to the hospital in time, do the relevant examination to clarify the cause of the disease, and then follow the doctor’s instructions for treatment to avoid delaying the condition.