1. Unqualified materials: Unqualified materials are easy to cause gingivitis due to tooth allergy and will fade and turn black. Poor material selection is very harmful to the oral cavity.
2, the tooth-making technology is not enough: generally, the occlusion adjustment is not good in the process of making all-ceramic teeth. If it is a slight occlusion problem, you can adjust the occlusion and continue to use it. If there is a serious occlusion problem, all-ceramic teeth must be pulled out and redone. In the preparation process, the dentist grinds his teeth too fast, which causes excessive stimulation to the dental pulp, and the dental pulp is in a state of congestion, or the all-ceramic teeth are not closed tightly enough to isolate the external bad stimulation.