Assertion: fluoride | /r/HasProperty | the key
Facets:
value: in a widely used cancer drug
type: OTHER
value: to control
type: PURPOSE
Source sentences:
text: Although there are recommendations to prevent tooth decay by other means, this nonsystematic review finds that fluoride is the key to prevention and control of tooth decay.
text: I also learned that fluoride is the key ingredient in a widely used cancer drug called 5-FU.