The mouth spits out a small yellow grain, huge odor, usually considered to be tonsilloliths caused by recurrent tonsillitis, or calcified plaque and soft scale formation of dental calculus. 1, tonsilloliths: tonsilloliths are smelly and filthy particles, mostly considered to be the result of long-term chronic inflammation of the tonsils. The tonsil crypt mouth is blocked, the shed mucosal epithelium, residual bacteria, food residues or secretions accumulate in the tonsil crypt, and calcium salts secreted by the salivary glands are deposited locally to form stones, which can be accompanied by foreign body sensation in the pharynx, sore throat, bad breath and other symptoms. Patients with tonsil stones have a better prognosis for active treatment, ensure good oral hygiene habits, small stones can be removed directly with pliers, larger stones affect swallowing, feasible tonsillectomy or incision to remove stones, tonsil stones with inflammation, antibiotic treatment can be given; 2, dental calculus: is attached to the tooth surface has been calcified or partially calcified plaque and tartar deposits, usually due to inattention to Oral hygiene leads to bacterial growth, oral mucosa infection leads to inorganic salt deposition, or saliva viscosity deposited on the surface of the teeth, can be yellow, brown or gray-black, usually not easy to fall off, may also suddenly fall so that the patient spit out the taste of a huge smell of small yellow particles. Normally, good oral hygiene habits should be ensured, and ultrasonic scaling is feasible to clean calculus and avoid periodontitis, bleeding gums and loose teeth caused by calculus deposition.