Safe. Tess pollen blocker in the patient's nasal surface to form a cellulose membrane, the nasal mucosa has no obvious toxic effect, is a safe and reliable method, allergic rhinitis patients allergic to pollen, in the pollen season application of Tess pollen blocker is more effective, can effectively avoid the patient's nasal mucosa and the pollen of each other contact, so as to improve the symptoms of allergic rhinitis patients nose.