It's just that Jackson was taking it to get to sleep every night. Usually people don't get put under that often.
I've had it a bunch of times and I wish going to bed was that easy, it's essentially an off button for the brain, but I would never take out for insomnia even I could get my hands on some. The rare times I get out under are enough and on that level it's perfectly safe.
It's the difference between smoking crack all day everyday vs every few years doing a line or two of coke.
So there's alway an anaesthetist at the dentists? O.o
Not sure what it was for this kid, but I got general anaesthesia when I had my wisdom teeth removed, and that's true for most people I know. You're pretty loopy for a while afterwards.