If your water is over-fluorinated, you have far bigger problems that stem from your local government.
“These sources include drinking water with fluoride, fluoride toothpaste—especially if swallowed by young children” Ie: swallowing makes it worse but the point of fluoride in toothpaste is to be absorbed, so some will get absolutely even in those who already have issues.
https://www.cdc.gov/fluoridation/faqs/dental_fluorosis/index....
Only at low levels: “Moderate and severe forms of dental fluorosis, which are far less common, cause more extensive enamel changes. In the rare, severe form, pits may form in the teeth.”
It’s a shame if you mention anything about possible negative effects of fluoride you get lumped in with the crazies.
(just to be clear I am a rational science freak, but my kids have higher priority and we know scientists and corporations have messed up more than once, not going into 'just trust us' with literal poison just because it has good side effects on teeth)
He said it happened as he grew up. Wikipedia says almost half of Americans have at least mild fluorisis, there's no need to blame the parents when an environmental/governmental cause is so readily established...
> Also, fluorosis is a cosmetic issue
That's what I thought too but Wikipedia also disagrees on this count:
The pits, bands, and loss of areas of enamel seen in severe fluorosis are the result of damage to the severely hypomineralized, brittle and fragile enamel which occurs after they erupt into the mouth.
Even if that was not the case, you'd need to prove that it's better than hydroxyapatite when applied topically, which (assuming effective) delivery will obviously not be the case.