1, improper mastery of indications If the original inflammation and swelling of the gums are not eliminated, before making porcelain teeth, should first be perfect periodontal treatment. 2, irregular operation caused damage to the gums The production of porcelain teeth need to choose special instruments, the use of formal techniques and in strict accordance with the operating precautions. 3, the incorrect shape of porcelain teeth lead to adverse stimulation of the gums The edge of the porcelain crown should be smooth, continuous and coordinated with the shape of the root, closely connected with the root of the tooth. The edge of the crown is too thick and too thin, not smooth or with a gap between the body of the tooth will cause stimulation of the gums, resulting in swelling of the gums. Treatment: First, conventional periodontal treatment should be used to remove tartar and plaque from the gums and neck of the teeth, and rinse with mouthwash; second, if there is no effect, the porcelain tooth should be removed and replaced with a temporary crown with a good edge shape for a period of time, and it is better not to bring a temporary crown because it is more or less irritating; second, if the swollen gums are still not better, gingivectomy is needed to remove the enlarged If the gingival swelling does not improve, gingivectomy is required to remove the enlarged gingival part and sometimes even debridement or orthodontic traction is required. Finally, local medication or systemic medication is used for the affected area.