i also understand that you tube is not reliable source but there is many other info out there lots and lots of info regarding fluoride what i find very interesting is that non fluoridating countries who have not fluoridated at all have the same if not better dental health
sweden has free dental until you are 18 . so that is big reason we vikings have good teeth compared but most Western countries have good teeth .
but the biggest benefit i think is diet and that parents now days make sure kids brush the teeth if diet is bad and hygiene is bad teeth will go bad also economy plays a big difference as well poor countries have bad diet and if you cant afford to eat buying a tooth brush is not nr 1 priority on your list