I'm 4 months post op and one side of my chin is still pretty numb. However, there is signs of life to it as around the area the nerve tingles when it is touched, so I'm sure it will come back over time.
It honestly is not that much of a problem, because how much sensation do you use in that area anyways? The most discomforting about it is that my facial muscles require a little more tensing to move the area, otherwise everything is good.
I'm blogging at: http://doublejawfix.blogspot.com/
