When the facial nerve is damaged, one side of the mouth and eyes are distorted, eyes are not fully closed, cheeks are puffed and whistles leak, etc. Through timely diagnosis and regular treatment, the facial nerve function will gradually recover. To determine whether the facial nerve is recovering, it is important to first understand the symptoms that may occur when the facial nerve is damaged. When the facial nerve is damaged, there will be facial expression muscle paralysis, forehead wrinkles disappear, eye fissures widen, the corners of the mouth droop, and when smiling or showing teeth, the corners of the mouth droop and facial skew are more obvious, and the sick side cannot make movements such as frowning, frowning, closing the eyes, puffing and pouting; when puffing and whistling, the affected side of the mouth can not close the lips and leak air; when eating, food residues are often left in the gap between the teeth and cheeks of the sick side, and there is often saliva from that side When eating, food residue is often retained in the interdental space on the affected side, and saliva often flows out from that side. Depending on the site of facial nerve involvement, there may be loss of taste in the anterior 2/3 of the ipsilateral tongue, auditory hypersensitivity, and tear and salivary secretion disorders. A few patients may experience discomfort in the lips and cheeks of the mouth. Some patients may have ipsilateral corneal or conjunctival injury secondary to reduced or delayed eye closing movements and incomplete eye closure, with symptoms such as eye redness and swelling. Therefore, the symptoms of facial nerve recovery are: (1) reduced symptoms of lacrimation; (2) restored sense of taste and reduced symptoms of food stuffing; (3) no leakage when gargling, restored sensation in the upper and lower jaws, tight mouth closure, no leakage when puffing cheeks and whistling; (4) the degree of crooked mouth begins to improve and the face looks more natural; (5) the ability to perform actions such as frowning forehead, raising eyebrows, closing eyes, puffing and pouting. In short, the symptoms of facial nerve injury should be promptly sought after, through timely and reasonable treatment, it is possible to gradually restore the function of the facial nerve.