American Dental Association Seal of Acceptance. You've seen it. It's a voluntary certification of dental products verified with laboratory tests. Since 1931.
Could use some more bolstering (or criticism) of the points here. It's just hard because almost everything written about them is from the dental industry which they deeply involved with anyway. Not much in the order of historical documents out there.
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.