The habit of breathing through the mouth can be corrected by receiving professional treatment, doing closed-mouth puffing training, and using auxiliary tools. Breathing through the mouth may be due to certain diseases in the body, which leads to nasal congestion and other problems, and you have to breathe through the mouth, you should go to the hospital in time to receive professional treatment to prevent facial abnormalities. Usually you can train closed mouth puffing, such as whistling, chewing gum, blowing bubbles, blowing trumpets and other ways to strengthen the cheek muscles, tongue movement, promote oral cleaning and change the habit of breathing through the mouth. Daily life can also be used with the aid of auxiliary tools, such as respirators or oral fixators, to play the effect of breathing with the nose, to improve the problem of breathing with the mouth, correcting the habit of breathing with the mouth needs long-term persistence, should pay attention to keep the nose open, remember to adjust the sleeping position before going to sleep, can also be corrected to a certain extent breathing with the mouth.