All-porcelain material is the most biocompatible with the human body and will not irritate the gums and cause gum inflammation and gum discoloration. Porcelain material is less tough than metal material, in order to strengthen the strength of all-porcelain and porcelain teeth need to be made thicker, so the amount of tooth tissue to be removed is more than metal porcelain teeth. Because of the advantages of all-porcelain and cast porcelain teeth are ideal for cosmetic dentistry, and the restoration of metal-free is a development trend. All-porcelain systems are developing very fast, and their material properties and processing methods vary. A clear understanding of the characteristics of the various all-ceramic systems, for the appropriate case. Selecting the most suitable all-ceramic system is an important step in the successful completion of aesthetic restorative work. First of all, from the all-ceramic material to distinguish, the current practical work more applications include white garnet all-ceramic (Empress I), lithium oxide based all-ceramic (Empress II), aluminum oxide based all-ceramic (Vita In-ceram, Wolceram, Procera), zirconia based all-ceramic (Everset, Ceracon, Cerec, Lava) systems, the overall material performance is characterized by a gradual increase in strength and a gradual decrease in light transmission. The actual case should be evaluated on a case-by-case basis. The choice of the appropriate all-ceramic material should be based on a comprehensive assessment of the aesthetic and strength needs of the restoration in the specific case. On the other hand, there are different fabrication processes for all-ceramic systems, which are currently common and include the hot-press casting process (Empress I, II), the infiltration ceramic process (Vita In-ceram, Wolceram), and computer-aided cutting (Procera, Everset, Ceracon, Cerec). The fabrication process will also have an impact on the choice of indications for the material system. Classification is easy to confuse people, we want to simplify the problem, the simple points on two categories: cast porcelain and zirconia. All-cast porcelain tooth color is a little worse, but only suitable for single crown, that is, a single tooth restoration, mostly for cosmetic purposes, the color performance is not as good as zirconium oxide, and when the dental tissue is dead pulp teeth, cast porcelain tooth restoration after a period of time will come through the dead pulp teeth black. Cast porcelain is a good material, but suitable for porcelain veneers, the results are very good. Zirconia all-porcelain tooth color is very good, because zirconia is white, it can cover the color of the native tooth, in the white inner crown of zirconia above the porcelain color better results. Moreover, in addition to single-crown restorations, it is also possible to do continuous-crown restorations, which are all-ceramic restorations with several teeth joined together. It can be cosmetic and restore the missing teeth, so the price is more expensive compared to cast porcelain teeth. Price: Due to geographical restrictions and different clinic grade charges also vary Cast porcelain crowns: generally above 2000 Zirconia: generally above 3000