Porcelain crowns are used to replace a damaged tooth, replicating the form and function of the natural tooth. The crown replaces the entire exterior of the tooth down past the gum line.
Porcelain crowns are used for multiple reasons. Crowns can act as a cover to protect a weakened tooth from further damage. Crowns offer protection to a tooth where a cavity filling is large and is overtaking the space in the tooth.
Teeth do not necessarily need to be damaged in order to use a porcelain crown. Discolored or crooked teeth can be covered with crowns to make them more cosmetically appealing.