Toothache after one year of root canal treatment with braces may be caused by infection and inflammation after wearing braces, tooth residue, or tooth splitting, etc. It can be treated according to the causes as follows. 1. Inflammatory infection: If the root canal treatment has been perfected, but the inflammation has not completely subsided, it may cause secondary apical infection, which may lead to toothache, and can be re-root canal treatment or direct apical surgery. 2. Residual material: If there are residual tissues that are not cleaned up when root canal treatment is done, toothache may occur frequently after braces are used. The crown needs to be removed and the root canal re-treated to clean out the residual tissue. 3. Tooth splitting: Biting hard objects is likely to cause tooth splitting, which will easily cause toothache. At present, you need to take dental radiographs to understand the condition of the tooth, if you find that the split tooth has no preservation value, you need to extract it in time. About root canal treatment wearing braces will cause toothache symptoms, need to analyze the cause of the disease and then carry out treatment, should go to the hospital in time for examination.