The benefits of using saline to wash the nose are as follows: 1. It can directly rinse away various inflammatory and allergic secretions in the nasal tract, improve the ventilation of the nasal cavity, and moisten the nasal mucosa to avoid repeated drying, rupture and oozing of the nasal mucosa. 2. 3. Regular rinsing of the nose with saline can help maintain the cleanliness and smoothness of the mucous membrane in the entire nasal cavity, sinuses, and nasopharynx, which is conducive to the better performance of drug therapy, as well as the drug therapy for rhinitis and sinusitis, which has a better synergistic improvement effect.