I had that done and it didn't hurt at all. Seriously, and I'm afraid of everything - I have anesthesia to have my teeth cleaned because of sensitivity and general fear.
The area of the grafts was sort of numb for a few days - maybe longer - following the procedure (slight interruption in the nerve endings?) and then they felt sort of itchy, like something that was healing. I was told not to eat or drink anything very hot or cold for a while or anything that was very crunchy so that nothing bumped into the graft.
Following the procedure, I wore a palate cover, sort of like a retainer that you'd wear after having braces removed. This kept the wound covered and I was able to eat fairly normally in just a couple of days and never had problems. Nothing could bump the roof of my mouth to cause any pain. I think that is the way to go.
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). He describes it as "not terribly enjoyable but it did what it needed to do". The procedure itself was quick and easy, but he says it took a long time for the roof of his mouth to heal (about a month) and he had issues eating during that time: the spot on the roof of his mouth was covered by cement while it healed, but the cement would sometimes shift, and if a tiny piece of food got lodged in there it was very painful.