The more severe the damage, the longer it will take to recover, and the lower the chance that you will completely regain normal function. If there is not much damage to the nerve, then you should get better completely within a few weeks. If damage is more severe, you may not fully recover-- even after several months.
Overall, chances of recovery are better if the treatment is started within 3 days of when the symptoms begin. If treatment is started at this time, 70% of patients make a full recovery.
However, when the treatment is delayed more than 3 days, the chances of complete recovery drop to about 50%. Children are more likely to have a complete recovery than adults.
Recovery may be complicated if the nerve grows back to the wrong areas (synkinesis), which may cause inappropriate responses, such as tears when laughing or chewing (crocodile tears). Some other people may experience blinking of the eye when they talk or chew food.