Assertion: fluoride's level | /r/HasProperty | optimal
Facets:
Source sentences:
text: A further 28 countries have water that is naturally fluoridated, though in many of them the fluoride is above the optimal level.
text: A further 28 countries have water that is naturally fluoridated, though in many of them there are areas where fluoride is above the optimum level.
text: So although water naturally containing 1ppm fluoride existed in very few places, it nonetheless came to be seen as the optimal level, and water containing less was deemed “fluoride deficient.
text: A further 28 countries have water that is naturally fluoridated, though in many of them the fluoride is above the optimum level.