Teeth that are discolored, chipped, decayed or poorly shaped are good candidates for veneers. It is generally accepted that porcelain veneers have the following advantages:

1.Compared with full coverage restorations, having porcelain veneers lost very little tooth structure.

2.Local anesthesia normally is not required for tooth preparation or placement of veneers.

3.The aesthetic outcome can be exceptional and the material of porcelain veneers provide resistance to stains from coffee, tea and other foods that natural teeth don't protect against as easily.

4.Typically no provision restorations are required.

Porcelain veneers is popular, especially to whiten teeth. However, it has some disadvantages:

1.The procedure is irreversible since the tooth enamel is removed, it will not grow again.

2.Relatively limited application, given that the tooth or teeth should be essentially intact.

3.Technique sensitivity, in particular demanding preparation criteria and moisture control at placement.

4.Possibility of marginal chipping and staining, especially if lute is exposed.