A dental repair is the restoration of a tooth, and a toothache after a dental repair is usually a filling. Toothache after filling may be caused by secondary damage, irritation from the filling material, bacterial residue and other factors. It is recommended to go to the hospital dentistry, if necessary, through the secondary repair, replacement of other materials, root canal treatment can relieve the pain. 1. Secondary damage: toothache does not usually occur after filling, if there is secondary damage and caries formation under the filling, secondary repair may be needed to relieve pain. 2. Stimulation of filling material: the carious part is deeper, and the filling material can cause pain by stimulating the pulp. If the pain is severe, you can remove the filling material, use other materials to cushion the bottom, and then fill the treatment. 3. Bacterial residue: If the caries is not cured before filling, the residual stimulation of bacteria can cause toothache. If necessary, root canal treatment is needed to avoid further aggravation of pain. To summarize, there are more reasons for toothache after tooth repair, it is recommended to visit the hospital stomatology department again and ask the doctor to deal with it.