If patients with rhinitis, sinusitis, etc. correctly use saline nasal wash for a long time, it is generally harmless, but if the general public is not recommended to use saline nasal wash for a long time, there is a possibility that it will improve the normal microenvironment of the nasal cavity, resulting in infection and other abnormalities. Rhinitis, sinusitis and other patients with long-term use of saline nasal wash, as long as the method is correct, generally harmless. Saline can be used for a long time. Generally with 0.9% saline nasal wash, can remove the inflammatory secretions and pathogenic bacteria in the nasal cavity, keep the nasal mucosa clean, effectively reduce the nasal mucosal congestion and edema, and play a role in preventing and controlling rhinitis. Because the nasal cavity is a special internal environment, its osmotic pressure and pH value is specific, ordinary people often or every day with a large number of saline rinse, may destroy the microenvironment of the nasal cavity, resulting in nasal immunity decreased, easily lead to secondary infections, so it is not recommended that normal people with saline repeatedly rinse the nose. It is recommended that you need to consult a specialist before using saline, and never use it on your own to avoid serious consequences.