Swelling and pain in the gums after a filling may be simple inflammation of the gums, or periapical inflammation caused by a miscalculation of the timing of the filling. Anti-infection treatment or root canal treatment is needed. 1. Gingival inflammation: Gums swelling and pain after filling need to be based on oral teeth and X-ray examination to determine the cause of the swelling and pain, may be external local stimuli caused by gum inflammation, generally use anti-inflammatory drugs anti-infection treatment such as metronidazole, amoxicillin, remove external local stimuli, such as bad restorations. 2. Apical periodontitis: Gum swelling after filling may also be the tooth inflammation has not been eliminated, filling caused by the acute attack of apical periodontitis, the need for thorough endodontic treatment to remove the root canal of the source of infection in order to be completely cured. After filling the gums swollen and painful, it is recommended to go to the hospital in time to check the causes of swelling and pain in a timely manner, to avoid affecting the work and life. The above drugs should be used under the guidance of a doctor.