Mouth tilt may be caused by facial neuritis, dental factors, cerebral thrombosis, etc. Facial neuritis can be treated with medication; dental factors can be treated with orthodontic treatment, and patients are advised to take reasonable treatment under the guidance of doctors; cerebral thrombosis can be treated with medication and surgery. 1. Facial neuritis: Facial neuritis patients may have symptoms such as crooked mouth, facial expression muscle paralysis, loss of frontal lines, inability to wrinkle the forehead and furrow the eyebrows, and abnormal sense of taste and hearing. Patients may be treated with medications such as prednisone, acyclovir, vitamin B1, etc. under the guidance of a doctor. Follow the doctor’s instructions for medication. 2. Dental factors: dental factors are generally caused by abnormalities in the bite of upper and lower teeth, patients need to wear braces or invisible braces under the guidance of the doctor for orthodontic treatment. 3. Cerebral thrombosis: Patients with cerebral thrombosis may have symptoms such as slanting of the mouth and slurred speech. Patients can be treated with thrombolytic and antiplatelet drugs under doctor’s guidance, or surgical treatment can also be used. Mouth slanting may also be caused by temporomandibular joint structural disorders, muscular factors and so on. Patients are advised to go to the hospital for examination and then treat the symptoms under the doctor’s guidance. Medications should be used under the guidance of a doctor.