Assertion: fluoride's use | /r/AtLocation | use
Facets:
value: for 6 years
type: TEMPORAL
Source sentences:
text: 1957 Records for New Britain, Connecticut (where the use of industrial fluorides had been in use for 6 years) showed that some of the children
text: 1957 Records for New Britain, Connecticut (where the use of industrial fluorides had been in use for 6 years) showed that some of the children's teeth had been damaged beyond repair where the water is fluoridated, even when the percentage of industrial fluorine is kept at or below 1 ppm, mottling is produced in 10-15% of the children examined.