I am almost 11 months after surgery and still experience a numb lower lip, chin, and tongue. I can move my face and tongue normally, but when I do I am aware of the numb feeling, or tingling. At other times I have tingling over the entire right side of my face when I have not been moving my face at all, and that comes and goes of its own accord.
Last month I cracked a lower tooth on the AN side, and felt tooth pain, but the novocaine had no effect on mouth, lip or chin. I felt none of the usual pins and needles when the novacaine would normally have been wearing off.
I did experience some numbness in my tongue, chin and lips as symptoms before surgery. I assume the numbness is here to stay as it was present before tumor removal.
I have been told by my surgeon's office that the time frame for recovery of my cranial nerves is 12 to 18 months, so I'll have to see where I am at those points. The surgeon did say he believed the tingling would stop eventually, but so far it is no better or worse since immediately after the surgery.
I still have the metallic taste all the time and find it less noticeable as time passes, not better, just not noticing it as much.
My vocal cord is much improved and so is swallowing so the Vagus nerve does regenerate, though slowly. But that has nothing to do with facial numbness.