According to the data, 80% of the patients with nasopharyngeal carcinoma in the world come from China, and the incidence rate in Europe is much lower than ours, because people wash their noses, just like we wash our hands, which is a daily habit. In fact, there are some reasons why nose washing is not popular in China. Since the nose washer entered the China market in 2007, the target users are patients with rhinitis and sinusitis. Directional promotion has lost a large part of the audience and directly affected consumers' cognition of nose washing. Most people think that only "sick" people need to wash their noses.
Actually, it's not. Just as regular cleaning and brushing of air conditioning filter can prevent dental caries, so can nasal cavity. When external viruses are rampant and air pollution is serious, nasal washing can help us clean the nasal cavity, prevent "diseases from entering through the nose", keep the respiratory tract healthy and clean, and treat many diseases. Many rhinologists, including now, will recommend washing children's nasal cavity with normal saline.
All the above are personal opinions.