The side effects of dental crowns are mainly the following: first, it will damage the pulp and gums, resulting in inflammation of the gums or infection of the pulpal nerve, then we need to remove the crown and carry out treatment of the gums and pulp; second, due to the resorption of the alveolar bone and gum atrophy, the edge of the crown may be exposed, if this happens, we need to remove the crown after Third, if the edge of the gum is stained, we need to remove the crown and choose the material of the crown again, so it is very strict when choosing the material of the crown, we try to choose the restoration of all-porcelain crown, because it does not contain any metal, there is no stimulation to the gum, no allergy phenomenon, so as to achieve a better aesthetic restoration effect.