Table salt prepared into a solution of certain concentration can clean the nasal cavity, 0.85% concentration clinically known as saline, has a cleansing effect, and the role of killing pathogenic bacteria, pathogenic microorganisms. Through osmosis, it can effectively improve the ability to resist diseases in the nasal cavity. After cleaning with saline every day, continue cleaning with water, and repeat cleaning several times a day can effectively improve the resistance of the nasal cavity to allergies, 0.85% concentration of saline, clinically known as saline, is harmless to the human body. If it exceeds 0.85%, it may have a certain irritating effect on the skin, but it must be washed with water after use. Usually pay attention to rest, pay attention to the combination of work and rest.