Sharing because I found this very interesting.
The Four Thieves Vinegar Collective has a DIY design for a home lab you can set up to reproduce expensive medication for dirt cheap, producing medication like that used to cure Hepatitis C, along with software they developed that can be used to create chemical compounds out of common household materials.
I have no idea. I’ve got some lidocaine viscous they gave me for the pain. I’m lucky enough to have medical, just not dental. But from experience, it helps temporarily numb the surface pain, but if it’s in the root, or if you’re pulling the tooth, it does not help.