Sleeping with mouth open has 3 situations: 1, nose problem, nose blocked; 2, pillow is not suitable; 3, there is the possibility of sleep breathing disease. In the nose when there is a problem of active treatment, if it is rhinitis or sinusitis, to be in the Department of Pentaclinic first rhinitis first treatment, because if the rhinitis is not treated, light adjustment of the pillow and go directly to do the oral cavity of the closed treatment, people have to suffocate out of the problem. So first go to cure rhinitis, there are nasal mucous membrane hypertrophy, excessive secretion inside the nose, or sinus inside the old pus, these cases must be actively dealt with. If the pillow is not suitable can do a few adjustments, with several different pillow shape pillow to try, which feel comfortable and can naturally let the mouth closed, you can choose. Sleep breathing disorders such as sleep apnea require hospitalization. There is another kind of bad habits have been formed, and the nose is not a problem, are ventilated, adjusting the pillow does not work, now there are special mouth stickers or special mouth closure bag, you can use these methods to change the bad habits of opening the mouth to breathe, you can change this situation.