@Anonymous1234567890,
I had all four wisdom teeth removed at once. It was many years ago, of course, and no funny gas was used. Unfortunately.
You need to ask your dentist, but I doubt you'll feel up to it that same day. I think the next day would be fine, though.
Make sure he gives you a little syringe to clean out the area - I didn't get one and the smell of teeny tiny rotting food became terrible so I went back and he said, "Oh, sorry! Here's the syringe to rinse your mouth out." duh. Really, you will NEED that!