Bell’s palsy is a weakness of the facial muscles due to inflammation of facial nerve. The inflammation develops around the facial nerve as it passes through the skull from the brain. The inflammation may squash (compress) the nerve as it passes through the skull. The nerve then partly, or fully, stops working until the inflammation goes. If the nerve stops working, the muscles that the nerve supplies also stop working.
Physiotherapy helps in strengthen the specific muscles of the face and the exercises should be done 4-5 times a day in front of a mirror. The mirror will also help avoid letting the good side overcompensate by moving in an exaggerated way. Facial exercises are preformed to keep the brain trained in what electrical impulses are needed to control the different muscles in the face. This will help transition back to using your facial muscles as the patient recovers from Bell’s palsy and the paralysis goes away.