Swollen gums in the place of filling can be caused by the following reasons: First, improper restoration of the adjacent relationship or filling body overhang, because there is too large a gap in the filling will lead to food retention in the gap, which in turn triggered inflammation of the gums. If there are too many fillings and the shape is not correct, it is also easy to stimulate inflammation of the gums, causing swelling of the gums. Second, the tooth itself is too large caries, in the filling because of the exposed pulp causes pulp infection, causing periapical periodontitis, then the patient’s teeth may have had pain, but after filling the inflammation did not release the location, the formation of abscess in the apical, but with ordinary gums food embedded in the pain is different, most of the abscess is located in the apical area.