Dental crowns are recommended when your tooth has a very large filling that exceeds the natural tooth structure, your tooth had root canal therapy, a combination of root canal therapy and a large filling, or cosmetic reasons.
The first step of the dental crown procedure involves using local anesthetic to numb the tooth and surrounding tissues. If you've had a root canal, your dentist will still likely choose to use anesthetic, because the instruments come very close to the gingival tissue.
