Tooth decay, commonly known as tooth decay, is a disease in which the hard tissues of the teeth are gradually destroyed by the action of bacteria and other factors. Dental caries does not directly cause the clinical manifestation of tooth inflammation, but if not treated in time, the lesion will spread to the deeper tissues of the teeth and periodontal tissues, which may cause complications such as pulpitis, gum disease and periapical inflammation, and thus the manifestation of tooth inflammation.