Mouth cocking may be due to adenoid hypertrophy, or it may be due to heredity, trauma, oral diseases and other reasons. 1. Adenoid hypertrophy: because of long-term adenoid hypertrophy, resulting in poor respiration, sleep at night often open mouth breathing, resulting in abnormal development of the mandible, adenoid face, high arch of the palate, upper incisor protrudes, mouth cocked. 2. Heredity: some people may be due to genetic factors, resulting in simply a thicker upper lip, causing mouth cocking. 3. Trauma: the mouth may be bumped by external forces, and the mouth is partially swollen, so the mouth looks upturned. 4. Oral diseases: such as gingivitis, oral inflammation, lip infection caused by lip swelling, so the mouth is cocked. The mouth is cocked, it is recommended to consult a doctor in a timely manner to identify the cause of the disease and then follow the doctor’s instructions for treatment.