Nasal cavity if long-term feel dry and scab phenomenon, which proves that the physiological environment of your nasal cavity has changed, the nasal cavity self-protection system has begun to have problems, if not pay enough attention, may cause rhinitis. But a long time to feel dry nasal cavity, which proves that your nasal mucosa problems, can not normal secretion of nasal mucus and regulate humidity, there is no suitable moist environment, the swing of the nasal cilia will be affected, over time, into the nasal cavity of bacteria, viruses, long-term accumulation of scabs will form, and these bacteria and viruses like this environment, will be ready to attack your fragile nasal cavity triggered by inflammation. Nasal self-protection system is mainly this work: from the nostrils into the air, the first encounter is the nasal vestibule in the nasal hairs, these nasal hairs are like rows of protective forest, the air in the larger dust particles or microorganisms in the nasal vestibule at the block. Air and then go in, you will encounter non-stop to the back of the nasal cavity in the direction of the swing of the nasal cilia, while the nasal mucosa will secrete mucus air dust particles or pathogenic microorganisms stick, and by the nasal cilia sent to the nasal cavity, the formation of phlegm in the throat to be coughed up or pharyngeal into the stomach by the gastric acid to destroy the bacteria. And nasal mucus also contains a lysozyme can inhibit or kill some viruses and bacteria. In addition, the nasal mucosa in addition to the continuous secretion of mucus also evaporates a lot of water into the air, so that it can always keep the nasal cavity wet, but also to ensure that the inhalation of air into the nasal cavity is relatively humid.