Position after MVD surgery

Hi
My mother was suffering from left side TN since 25 years and at last she have under gone through MVD surgery in institute of neuroscience kolkata (INDIA) in may 2016. After surgery every thing is well but her left face (teeth, toungue, chick ) has no any sense till now. My neurosurgeon is saying it will fine after some time but i think it will long for life time or it will take longer time to become normal. Any body please help me about this.
Thanks
Sanjeev