It’s not going to kill anyone, but it is a systemic, cumulative poison that finds it’s way not only into your teeth, but your glandular tissues, thyroid, pineal gland, brain, breasts if ya got em, sex organs, and bones. Because of this it lowers metabolism and increases your risk of disease. Detox it with Iodine, the largest halide.
They promote fluoride as a cost-benefit, the increased risks are the costs, and we know all too well what they say the benefits are. The form of fluoride they give water company is the same form of spent nuclear fuel, aka Hex (H2 UF6), It is Silicon Hexafluoride,(H2 SiF6) a byproduct of aluminum smelting and creating phosphate fertilizer; which contains what ever else is found in that slurry.
The trouble your body has with dealing with fluoride is because it’s the most electronegative of all elements. Meaning, when it forms bonds with your biology, the catalysts involved take much longer to complete. Errors occur, Mineralization suffers.
If you’re worried about cavities, eat an alkaline diet. It’s much more conducive to mineralizing your teeth. But thats another question.