Tooth pain can be caused by a variety of factors, including decay, pulpitis, periapical infection, and wedge-shaped defects, dentin sensitivity, etc. If the toothache is still painful after several days, it is likely that the tooth is suffering from the above diseases that can cause toothache. If you do not take treatment, even after several days of pain, the pain still occurs. It is necessary to treat the disease, repair the caries, root canal treatment for pulpitis and periapical infection, desensitization treatment or filling treatment for wedge-shaped defect, and desensitization treatment for dentin sensitivity. As long as these dental diseases are completely treated, the pain can disappear completely. Therefore, if a toothache is not treated, it is likely that the pain will continue to occur after a few days.