After five years of having porcelain teeth, a sudden toothache in the past few days may be due to decay of the abutment teeth below, gingivitis or periodontitis. If there is an abutment underneath the porcelain tooth, and no dental treatment was carried out before the restoration, decay of the abutment may occur after a long period of time and cause a toothache. You can take an apical radiograph of the tooth for differential diagnosis. The decayed abutment teeth need to be treated promptly. It can also be caused by gingivitis or periodontitis due to the prolonged stimulation of porcelain teeth. Porcelain teeth used for five years alveolar bone resorption, there is a gap between the teeth and gums, food impaction caused by gingivitis or periodontitis triggered headaches, need to be restored. So the toothache after five years of porcelain tooth repair, is the abutment tooth decay or gingivitis, etc., need to go to the dentist for medical treatment.