Assertion: wisdom tooth's root | /r/MadeOf | age
Facets:
value: seldom
type: TEMPORAL
value: fully
type: DEGREE
value: firstly
type: MANNER
Source sentences:
text: Crown formation is usually complete by age 14 years, and the roots are approximately 50% formed by age 16 years.
text: Firstly, at this age the roots are seldom fully formed, even though the tooth has become impacted.