You should consult a neurologist if you have a crooked mouth. Most of the symptoms are caused by idiopathic facial nerve palsy, and may also be caused by cerebrovascular disease, and can also be seen in patients with Green-Barre syndrome.1. Patients with idiopathic facial nerve palsy mainly present with peripheral facial palsy, which can be characterized by loss of frontal lines on the lesion side, shallow nasolabial folds, skewed corners of the mouth to the lesion side, wind leakage on the lesion side when whistling, and incomplete eyelid closure on the lesion side. The white sclera can be exposed when the eyes are closed, also known as the bell phenomenon. In patients with central facial palsy, the frontal lines are basically symmetrical, the nasolabial groove is shallow on the opposite side, the corners of the mouth are crooked on the opposite side of the lesion, the wind leaks on the opposite side of the lesion when whistling, and the sensory and motor function of the limb on the opposite side of the lesion may be impaired. If a patient is considered to have Green-Barre syndrome, he or she may have asymmetrical forehead lines, shallow nasolabial folds, and crooked corners of the mouth.