Disadvantages: The hair that grows in the nose acts as a natural filter. Pollen, dust, dirt, bacteria, etc. flying in the air stick to the nose hairs and prevent them from entering. In this way, nose hairs act as a natural filter. Cutting the hair in the nose can allow bacteria to enter. Some people may also experience itching, burning, and weakness in the nose. There is a risk of injury from cutting the nostrils.