Veneers, that is, oral restorations, materials are selected as follows: 1, fixed restorations: the general use of metal porcelain teeth or all-porcelain teeth. Metal porcelain teeth including heavy metal porcelain, precious metal porcelain, all-porcelain teeth including glass ceramic, aluminum oxide and zirconia all-porcelain, etc.. All-porcelain teeth have the advantages of good tissue biocompatibility, aesthetics, comfort, not easily sensitized, MRI examination without removal, etc., but the cost is relatively high; 2, movable restorations: the general use of resin teeth, porcelain teeth are used less frequently. The abutment of movable teeth includes plastic abutment, metal abutment of stainless steel, and Vitalin, pure titanium abutment. The advantages of Vitalin and pure titanium brackets are good tissue biocompatibility, lighter, and more comfortable to wear.