1, missing teeth, and the missing less, the neighboring teeth are healthy, no inflammation or although there is but after treatment has been controlled, can be porcelain restoration; 2, tooth color or morphology is not good, such as tetracycline teeth, vertebral teeth; 3, the alignment is not suitable for orthodontic treatment patients, can be considered to do porcelain restoration; 4, due to trauma fracture segment of the tooth or residual root, such as the root has sufficient length, periodontal The situation is good, after perfect root canal treatment, can be porcelain restoration; 5, due to dental caries and other reasons tooth loss is large, tooth discoloration, can restore the beauty and function through porcelain teeth.