When is a crown needed?
A crown is recommended when a tooth is too damaged to be restored predictably with a filling alone. Common reasons include a large old filling that leaves thin, weak walls; a cracked or broken tooth; and back teeth after root canal treatment, which are more prone to fracture without protection. Crowns are also used on dental implants, as part of a bridge to replace a missing tooth, and to replace old metal-ceramic crowns that show a dark line at the gum. Where enough tooth remains, we may suggest a more conservative onlay instead.