Nasal hair functions include filtering foreign particles from entering the nasal cavity and collecting moisture.[1] In support of the first function, the results of a 2010 study indicated that increased nasal hair density decreases development of asthma in those who have seasonal rhinitis, possibly due to an increased capacity of the hairs to filter out pollen and other allergens.[2] However it can grow far, far longer than biologically necessary leading to “chronic nasal beard”.
Kenashii applicators are designed to remove the hair around the edge of the nostril, only targeting the hairs that are easily noticed. There is still plenty of hair remaining within the nose and nasal cavity to perform the required physiological functions.