Assertion: tooth | /r/HasAspect | a root canal
Facets:
Source sentences:
text: The tooth has had a root canal, which actually looks good, but the abscess is not healing.
text: So, a tooth that has had a root canal almost always needs to be restored with a crown immediately to prevent it from fracturing.
text: If that is the case, the tooth will need to have a root canal, or be extracted.