Assertion: sodium fluoride | /r/ObjectUse | used as a rat poison
Facets:
value: in the past
type: TEMPORAL
value: commonly
type: TEMPORAL
Source sentences:
text: Sodium fluoride has been used as a rat poison in the past but the fluoride in that is at much higher concentrations than is found in tap water or toothpaste.
text: Sodium fluoride has been commonly used as a rat poison in the past.