Assertion: fluoride | /r/HasProperty | common factor
Facets:
value: in most toothpastes
type: LOCATION
Source sentences:
text: In 1931, an Alcoa chemist, H.V. Churchill, concerned about a possible link between aluminum and staining, analyzed water from several areas where the staining was common and found that fluoride was the common factor.
text: Though fluoride is a common ingredient in most toothpastes, that doesn’t make it safe to use.