Dental crowns are a common dental procedure used to cover a tooth that is worn, broken, or decayed. The crown can be made of porcelain, metal, or both. It is fabricated in a laboratory to the dentist’s specifications and then cemented into place, so that it fully covers the tooth at and above the gum line. A dental filling (adding dental material to a tooth) can be used to repair a damaged tooth or reform the shape of a tooth, but the results may not prove as durable or aesthetically pleasing as a crown.