One kind of dental work that completely covers the part of a tooth that is above the gum line is a crown. Crowns effectively replace the tooth's surface by encasing the whole visible portion of the tooth. If decay has destroyed enough of the tooth that there is no longer a stable tooth structure, our dentists could advise getting a crown. Usually, two visits are needed for crowns. The tooth will be prepped during the initial appointment. This include removing all the deterioration and making a crown imprint. The permanent crown will be positioned during the second appointment. Your crown is custom made during the two appointments, which are typically spaced two to three weeks apart.