Sleeping with the mouth open may lead to laryngitis, adenoid facies and other hazards that need to be specifically analyzed. 1. pharyngitis: saliva contains certain lysozyme has a bactericidal effect, long-term open-mouth sleep may lead to a reduction in saliva in the oral cavity, long time oral bacteria may breed, if the patient at a certain time immunity is low, it may lead to laryngitis, and even prolonged for chronic inflammation. 2. Adenoid face: sleeping with the mouth open for a long time may change the development of jawbone and teeth in the patient’s mouth, developing into adenoid face, i.e., jawbone becomes longer, palate bone is high arch, teeth are not aligned, etc.. Sleeping with the mouth open can cause a series of harm to the body, patients who find themselves sleeping with the mouth open for a long time and can not be corrected, then it is best to consult a doctor in a timely manner, improve the relevant examination under the guidance of the doctor to carry out targeted treatment.