Enamel is one of the four layers of tissue that make up the human tooth. As the outermost layer, enamel covers the crown of a tooth, making it the visible part of all teeth. Enamel is considered to be the strongest material in the human body, and yet it is susceptible to decay by the ingestion of sugar.
In cosmetic dentistry, a common procedure that may be done is the use of porcelain enamel, or porcelain veneers. A porcelain veneer is meant to be placed to over the exposed side of the tooth, providing for a natural and improved aesthetic look while also allowing for protection of the underlying enamel from further harm.