Meanwhile...fluoride is not meant to be swallowed and only applied topically - that's why every single tube of toothpaste tells you NOT to swallow it!
Also:
There is no critical thinking amongst the masses. And here we are.Is fluoride good for teeth?
Short Answer: Not when swallowed.
Long Answer: Back in the 1950s, when fluoride was believed to be a “nutrient,” dentists believed fluoride needed to be swallowed to be most effective at preventing cavities. That is why fluoride was added to things that people swallow: water and prescription pills (fluoride supplements). Today, however, dental researchers overwhelmingly agree that fluoride’s main benefit to teeth (whatever that may be) comes from topical application, not ingestion. Even if one believes that fluoride is good for teeth, therefore, there is no need to swallow it.
This helps explain why countries that do not fluoridate water (most western nations) have tooth decay rates that are just as low as the few western nations that do fluoridate water. Similarly, most researchers now concede that swallowing fluoride supplements is not an effective way to prevent cavities. Adding fluoride to water or pills is neither necessary, nor effective.