1, the position of the edge of the porcelain tooth: the back edge of the porcelain tooth should be located between the tooth and the gum edge, and deep into the gum edge under 0.5 millimeters or so. From the appearance of porcelain teeth and gums into one, and natural teeth. 2, the tightness of the gap: porcelain teeth and neighboring teeth should be moderate contact. If too tight, the patient has a serious sense of extrusion; if the gap is too large, easy to cause food congestion after eating and induce dental caries and gingival papillitis. Moderate contact is slightly squeezed patients, available dental floss self-check, that is, dental floss from top to bottom through the gap when you feel a certain resistance. 3, chewing comfort: after wearing porcelain teeth, patients should try general biting action, feel the teeth in the chewing force is uniform, there is no sense of soreness. 4, color: in the natural light, the color and gloss of porcelain teeth should be similar to neighboring teeth, to be rich in layers and transparency; especially the front teeth, pay attention to the incisal edge of the teeth from the neck of the teeth should be consistent with the tone, gloss. Tetracycline teeth and dental fluorosis patients should check the color of porcelain teeth and gums, skin color coordination. 5, form and arrangement: porcelain teeth should have the normal form of natural teeth, its size and neighboring teeth, and symmetrical teeth with the same name. The cut end of the front teeth should be on the arc of the dental arch, and the cusp of the back teeth should be located on the line of the natural tooth cusp.