Assertion: dental floss | /r/HasProperty | n’t used product
Facets:
value: until 1815
type: TEMPORAL
value: widely
type: DEGREE
Source sentences:
text: Dental floss wasn’t a widely used product until 1815, when Dr. Levi Spear Parmly, a dentist from New Orleans, invented a thin, waxen silk thread to help his patients clean between their teeth.