Redness and swelling of the gums after filling is likely to be caused by a deeper bad location, damage to the gums during the preparation of the cavity, and inflammation of the gums caused by poor oral hygiene after filling. Or if the filling has an overhang that irritates the gums and causes redness and inflammation, it is necessary to go to the hospital in time to remove the bad restoration and reshape it for filling. In fact, the filling treatment technique is not simple and requires a doctor with professional skills to carry out, and the shape of the filling needs to be shaped well during the treatment to avoid excessive overhangs that irritate the gums or food embedding due to poor adjacent connections, and there are certain instruments to help in the filling. Patients should try to choose a more formal hospital or clinic for filling, and try to choose resin-based materials that are less irritating to the old gums. Try not to use silver-mercury materials for filling, as they have been eliminated in dentistry.