The reasons for pain after denture are as follows:1, fixed denture crown neck edge is too long, extrusion of the gums so that the color of the whitening of the obvious swelling and pain, need to repair the crown neck edge and then try to wear and bonding.2, fixed denture abutment teeth for the living pulp teeth, due to the preparation of the teeth will be abraded in part of the tooth enamel and dentin, abutment teeth are easy to produce sensitivity to external stimuli and the release of adhesive chemicals, about a week or so, abutment teeth can gradually adapt to the symptoms will be slowly relieved.3, movable denture repair abutment edge roughness or tissue surface there are small tumors, can press the tissue surface so that mucous membrane trauma ulcers. 3, movable denture repair when the edge of the base bracket is rough or the presence of small tumors on the tissue surface, can compress the tissue surface so that mucous membrane traumatic ulcers, need to adjust the edge of the base bracket grinding, trimming the foreign body at the same time polishing in order to improve the symptoms.