I had considerable numbness around and in my mouth on the AN side of my face, including my tongue. There was no initial improvement following my surgery and it finally started to normalize at about 2 years. At 3 years plus now, it is even better. I do wonder though if it has improved so much or I have just become accustomed to it, and realize it may be a combination of both factors.
While not a doctor, I don't believe the numbness pre-surgery means facial paralysis post-surgery. Numbness and tingling are common symptoms of AN's and many people regain more normal sensation in their faces with time. Just remember that whatever complications you may experience from the surgery, if any, most of them are temporary and will get better. Those that do not improve are often treatable and we learn with time to adjust to and compensate for them. People are more resilient than they at first credit themselves. Good luck.