A cavity that hurts a lot is considered to be pain caused by pulpitis and requires medical attention for root canal treatment. You can also take ice water or ibuprofen painkillers for temporary relief. However, it is recommended to seek medical attention as soon as possible to avoid the condition from progressing in an undesirable direction. Root canal therapy: Root canal therapy is generally a more effective treatment for nerve damage or pulpitis. The treatment involves removing decayed tissue from the cavity, opening the cavity to clean the infected root canal, and using medication to reduce inflammation and pain. After root canal treatment, restorative treatment can be performed to fill in the missing tooth tissue and restore the function and aesthetics of the tooth. When a toothache occurs, it is necessary to seek medical treatment as soon as possible to develop a treatment plan for the condition of the affected tooth and to treat the symptoms. Avoid causing periapical inflammation, resulting in the spread of inflammation, swelling and pain aggravation and other adverse conditions.