Assertion: enamel | /r/HasProperty | tough
Facets:
value: very
type: DEGREE
Source sentences:
text: Tooth enamel is very tough.
text: Enamel is very tough.
text: If tooth enamel is so tough and has the ability to last for so long, then why do we hear so much about protecting and strengthening it, and losing it and repairing it?