This method is to remove the enamel on the lip side first, and then cover the tooth surface with porcelain to cover the discolored teeth. This method has good color masking effect, wide color range for patients to choose and high bonding strength with teeth. However, the disadvantage is that more tooth tissue needs to be removed evenly. If the porcelain veneer is damaged, it usually needs to be completely removed and re-made, and the manufacturing cost is relatively high.

Method 2: 3D ecological beauty crown restoration.

3D ecological beauty crown needs to grind the surface of the whole tooth (about 1mm) evenly, and the prepared tooth is like a miniature version of a normal tooth. Then beauty crown is used to restore the shape of the teeth, thus changing the color of the teeth. The retention effect is good, and at the same time, some teeth' own deformities are corrected, such as too small crown and too large gap.

Method 3: tooth bleaching (tooth bleaching)

The main principle is to use some drugs to reduce the calcification of enamel, reduce its transparency, make teeth white and achieve the effect of shading. The advantage is that it is not permanent to teeth.