Assertion: formaldehyde | /r/ObjectUse | used as dentine desensitizing agent
Facets:
value: for the same supposed effect
type: PURPOSE
value: formerly
type: TEMPORAL
value: although unsuccessfully
type: MANNER
Source sentences:
text: Formaldehyde was formerly used as a dentine desensitizing agent, and has even been included in toothpastes (with a pungent taste!) for the same supposed effect, although unsuccessfully.