1 · The nose conditions airThe nasal cavity slows, warms, and humidifies air, while hair, mucus, and cilia trap part of the particle load.MECH · moderate
2 · Sinuses release NONitric oxide produced in the sinuses travels with nasal inhalation into the lower airway and may help ventilation-perfusion matching.MECH · moderateMECH · moderate
3 · Do not tape against obstructionIf the nose is obstructed, mouth tape only increases resistance.Address rhinitis, septum issues, and OSA red flags before nighttime aids.GUIDE · high
4 · Train comfortable airflowPractice closed-mouth nasal breathing at rest and during light movement.The goal is comfort and efficiency, not breath-hold challenges.REVIEW · moderate