The prosthetic can be reused for a touch up every six to twelve months depending on the patients life habits. The other process is reshaping and veneering. One of the most revolutionary developments in dentistry is the ability to bond to existing tooth structure. A veneer is about the only way to restore a white tooth color with aged teeth. There just isn't enough enamel left to bleach, and the color beneath the enamel tends to be yellowish and dark.
Porcelain veneers are thin shells of porcelain that are bonded on to the existing teeth.
Like false fingernails, although much more durable and lasting, they cover the front of the teeth and are able to whiten the teeth, fill gaps, change shape, eliminate crooked teeth, lengthen short teeth, and dramatically improve unattractive smiles. Teeth that are too long or misshapen are reshaped by removing or adding porcelain. The alignment is corrected, and then a veneer is placed over the old enamel and the built up surfaces. The result is an even set of teeth with a bright surface. Some elect to have only the most visible teeth reshaped and veneered, the four or six upper front teeth.