Assertion: fluoride's level | /r/HasProperty | recommended by the u.s. public health service
Facets:
value: for fluoridation of public water supplies
type: PURPOSE
Source sentences:
text: At the level recommended by the U.S. Public Health Service for fluoridation of public water supplies (0.7 mg/L, or parts per million), the fluoride ion has little influence on either corrosion or on the amounts of corroded metals released into the water.