Unfortunately you will find some people referring to a “Tolerable Upper Intake Level” of Fluoride.
There is no such thing because Fluoride is bio-accumulative and your internal “dose” increases continuously until you die.
You would prefer to die of something not caused by Fluoride, would you not?
Fluoride is a bio-accumulative, endocrine disrupting, neurotoxic carcinogen – not a nutrient
Fluoride is a bio-accumulative, endocrine disrupting, neurotoxic carcinogen – not a nutrient (PDF Download Available). Available from: https://www.researchgate.net/publication/285771633_Fluoride_is_a_bio-accumulative_endocrine_disrupting_neurotoxic_carcinogen_-_not_a_nutrient [accessed Jan 05 2018].