Bulging gums after dental crowns may be related to chronic apical inflammation, gingivitis, and other causes. Bulging gums after wearing crowns may be caused by chronic apical inflammation, probably because the crown stimulates the apical peripheral tissues to produce a chronic inflammatory reaction, and the formation of inflammatory granulation tissue may lead to bulging gums, which will appear repeated pus, repeated swelling and pain, etc., can be treated by root canal therapy. Wear crowns after the gums bulge may be caused by gingivitis, teeth on the crown material rejection caused by gum inflammation, there will be redness, swelling and pain in the gums, gums bulge, bleeding gums and other symptoms, the patient can wear a period of time to adapt to a little bit, if the swelling or bulge does not subside, can be through the gingivectomy method of treatment. Therefore, after wearing crowns after the gums bulging patients, should go to the hospital as soon as possible to clarify the cause of the disease, after diagnosis under the guidance of the doctor for standardized treatment.