There are many causes of sleeping with the mouth open, including chronic rhinitis and adenoid hypertrophy. Sleeping with the mouth open for a long time can lead to appearance changes and laryngitis, which need to be analyzed specifically. 1. Changes in appearance: sleeping with the mouth open for a long time can lead to protruding upper incisors, teeth alignment, etc., and eventually adenoid face. 2. Laryngitis: sleeping with mouth open for a long time, a lot of water evaporates from the mouth, leading to dry throat. At the same time the dust in the air, bacteria and other harmful substances in direct contact with the throat, may lead to chronic pharyngitis. People who sleep with their mouths open for long periods of time are advised to seek timely medical attention, and if the disease is caused by early treatment, to avoid delays in the condition. It is recommended to correct the habit in time after ruling out the pathology.