Allergic rhinitis is treated with desensitization therapy. First of all, it is safer, and then it is possible to achieve the effect of eradication and no recurrence. Just say it is possible! Principle of action: Application of allergic substances allergens, through internal injection or external use, so that the concentration increases, so that the body produces anti-allergic antibodies, so that there is no reaction to the allergen. Desensitization therapy is currently available in major hospitals for in vivo injection desensitization and in vitro desensitization, while in vivo injection desensitization is more prone to allergic reactions than in vitro desensitization, which is sometimes very dangerous, and in vitro desensitization has been used in recent years. In vitro desensitization treatment includes sublingual desensitization series of treatment products, which use extracts of allergens to drop under the tongue to make the respiratory mucosa tolerant, so as to reduce or control allergy symptoms and reach the purpose of desensitization treatment, which is relatively simple to apply, painless to patients and less expensive than in vivo desensitization. However, the specific therapeutic effect depends on the results of a large number of clinical observations.