Using mouth tape when you have nasal congestion might not be the most comfortable experience. The purpose of this tape is to encourage nasal breathing, but this can be quite challenging when your nasal passages are blocked, whether due to factors like the weather or sinus issues. For many people, breathing naturally through the nose can actually help relieve nasal congestion. On the other hand, breathing through the mouth in such situations can sometimes worsen mucus production and lead to airway constriction, which can amplify the discomfort of a stuffy nose. Given this, the choice is yours. If you find it uncomfortable or counterproductive to use the tapes with a congested nose, it's a good idea to pause until your nasal passages are clear. These tapes are designed to promote nasal breathing, and your comfort and well-being are our top priorities.