Crowns are full coverage restorations that are used to cover a tooth that is likely to break or is too broken down to be restored with a filling. They are commonly done after root canal therapy, or when a large filling wears out. Crowns are placed over the weakened tooth, providing strength and protecting the tooth against breakage. It takes two appointments to restore a tooth with a crown. In the first appointment, any decay present is removed from the tooth. The tooth is then shaped to perfectly fit the crown, an impression is taken, and a temporary crown is inserted. In the second visit, the temporary crown is removed, any necessary adjustments to the permanent crown are made, and the permanent crown is put in place.