Tooth decay abscess, i.e., caries complicating abscess formation, untreated can cause tooth loss, affecting chewing function, at the same time, the presence of abscess foci can cause diseases of distant tissues and so on. Tooth decay, i.e. caries, is the main cause of tooth loss. Loss of teeth can cause low chewing function, affecting the digestion and absorption of food, leading to malnutrition. At the same time, if caries is not treated in time, it will develop into chronic periapical abscess, and a fistula will appear in the gums, and pus will flow repeatedly, which will form a “lesion”. Bacteria and other pathogens in this lesion can cause diseases or symptoms in distant organs, such as arthritis and endocarditis. If you feel unwell, it is recommended that you seek medical advice and treatment.