Feeling pain two years after a root canal with braces may be caused by inflammation of the tooth’s pulp or inflammation of the gums. Reinfection may occur after a root canal procedure and the presence of inflammation within the root of the tooth can cause tooth pain, such as pain when eating. An apical radiograph of the tooth needs to be taken and if there is a shadow at the root tip, a new root canal is needed. If the gums are bleeding, red, swollen and painful, it may be related to the crown restoration materials, such as metal porcelain crowns using non-precious metal materials, causing gingivitis, or periodontitis. Porcelain inner crowns need to be replaced. Therefore, imperfect root canal treatment is the main cause of pain after crown restoration, you can go to the stomatology department to check, if necessary, root canal retreatment or periodontal treatment.