Foul-smelling small rice grains in the mouth are usually tartar, which is usually found on the surface of the teeth at the opening of the salivary glands. The main treatments include brushing, scaling, and subgingival scraping. 1. Toothbrushing: the correct brushing method must be used: vertical toothbrush up and down brush. In addition to cleaning dental plaque, tartar dirt, food debris, etc., can prevent the formation and deposition of dental calculus. At the same time, brushing the teeth to promote blood circulation in the oral cavity and gums, and enhance the immunity of periodontal tissues. 2. Scaling: Clinics generally use ultrasonic scaling, focusing on dental calculus. Dental calculus is easy to plaque accumulation, resulting in bleeding gums, periodontal disease, gingivitis. The clinic advocates regular scaling and safe scaling. 3. Subgingival scraping: If the dental calculus is located in the subgingival, it is necessary to carry out subgingival calculus scraping, root planing, eliminating gingival gingival inflammation, restoring the state of health, regular maintenance.