To limit breathing through the mouth, each person tries a number of preventive measures at home.
Practice breathing in and out of the nose, keep the nose clean, relieve stress so as not to pant with your mouth, use a larger pillow to rest your head when you sleep, exercise.
During intense exercise, the nose is blocked due to a cold, then you should breathe through your mouth to get air into the lungs.
According to WebMD, nasal breathing has more benefits than breathing through the mouth by helping to humidify the inhaled air.
During breathing, the nose releases nitric oxide (NO). NO is a vasodilator, which expands blood vessels. This can help improve oxygen circulation in the body.