Facial nerve problems involve the facial nerve, which is the nerve that controls the muscles on each side of the face. This nerve allows you to show expressions. If this becomes affected, it can make your facial muscles weaker and can make your half face-paralyzed. The side of the face becomes weak and droops, and some of its branches can’t do the functions of the mouth and the face. This condition can make you lose facial expressions, and in some point, might make it difficult for a person to speak, eat, and drink. It can also lead to difficulties in blinking and closing your eyes, and might even damage the cornea of your eye.