There are many causes of crooked mouth, and whether it can heal on its own needs to be considered in conjunction with the cause, and cannot be generalized. When a mildly crooked mouth occurs, the first thing to distinguish is whether the crooked mouth is caused by cerebrovascular disease or facial neuritis. If the crooked mouth is accompanied by symptoms such as hemiplegia and numbness of the limbs, and if there is a history of hypertension and arteriosclerosis, it can be judged to be caused by cerebrovascular disease. In the case of mildly distorted mouth caused by neuritis, only nerve edema and demyelination appear in the early stage, without degeneration or necrosis, and once the edema is reduced, it can recover on its own, but this case is less common. Patients are advised not to take any chances and should consult a neurologist promptly after the appearance of mildly distorted mouth to identify the specific cause and to provide targeted treatment.