I have a whole rant on this topic, but the short version:
It’s dentists.
The gnarliest mountain man, who hunts bears with his bear hands, can be brought to his knees with a toothache. The toothache never sleeps, can’t be fought, and always eventually wins. Even basic dentistry is life saving - even another human with a pair of pliers and some moonshine - but I’d much rather have novocaine.