[bsder]

You think that the governments of the world with much poorer people wouldn't jump on something like this? Improving dental health dramatically improves outcomes all across the board.

If something works, someone, somewhere in the world would start using it. Hell, people are willing to use stuff that is flat out harmful simply because some people on the internet said so.

The big issue with bio things is that the human organism has a lot of variation and a lot of cures sorta work for some people some of the time. Consequently, a high enough bar to get FDA clearance has to be significantly strong.

(Two good recent examples: A woman died from oxalate overload from drinking green smoothies and Vitamin C and anti-oxidants can spur cancer growth. Does that mean that everybody should stop drinking green smoothies and taking Vitamin C? Obviously no. But it shows that humans vary and that things aren't always straightforward.)