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Nitrous Oxide doesn't knock you out, it just (deeply) sedates you and is a moderate pain killer.
With IV administered general anesthesia you're knocked out in literal seconds, it's wild if you've never experienced it. I've been "put under" three times: twice to have my 4 wisdom teeth removed and once for inguinal hernia surgery. It messes you up for a good hour or two post-surgery though.
The effects of Nitrous Oxide are reversed within a few minutes of cessation of exposure to the gas (I've done it recreationally numerous times, inhaling it while drunk is a wild experience everything is in slow motion like you're looking into a strobe light).
Damn when I got my wisdom teeth removed they gave me chewing pills and all I remember was taking them then waking up and being shown the pieces of teeth. Supposedly I was incessantly singing Bohemian rhapsody even though I didn't think I knew the lyrics.
I find it quite interesting that they do this in the US even at the dentist. I've had all 4 wisdom tooth removed by local anesthesia. I was perfectly consciouss the whole time.
It’s definitely not always done with general anesthesia in the US, unless standards have changed in the last couple decades? I had all mine taken out in the 2000s with just local.