First off, nsfw or people with sensitive stomachs.
Here is a rather old video, but incredibly interesting!
For those who don't feel like watching, basically it is this:
A woman goes under hypnosis instead of anesthesia and has her two front teeth removed, and dental implants put in place.
The dentist is also the hypnotist that guides her in her trance and together they had set up a comfort scale from 0-6 (with 0 being perfectly comfortable) to keep track of how she does, so they can administer something to help if she gets to a 6.
For the majority of the procedure she stays at a 0, though at one point she does drift up to a 3.
Really wild stuff!
Let me know what you think of all that in the comments and I'll see you on the block!