I sustained some nerve damage during a wisdom tooth extraction many years ago, and was told to increase my intake of B vitamins, especially B6, but no other advice was given. That area of my lip
and gums remained numb for years. The numbness is gone now, but I have a reduced sensation of pain in that area, so I would describe it as partially healed.
Actually, I think, experimentally, NGF was found to heal wounds - ulcers, fractures etc. at an accelerated rate.