A short YouTube video segment (uploaded Oct 20, 2023 by Josh Trent) describing the physiological harms of mouth breathing: it impairs sleep, can cause a pediatric “adenoid face” by altering facial growth when children have enlarged adenoids/tonsils, leads to dry mouth and more cavities at night, and forfeits the nose’s normal roles of humidifying, warming, and filtering inspired air.
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When you look at mouth breathing, what are the physiological effects that are very, very deleterious to health? So we know that it impacts your sleep. And when you're a mouth breather, then especially children, there's something called the adenoid face, which kids have big adenoids in the back with their tonsils and it obstructs their nose and they become a mouth breather. It actually changes the shape of their face. Nasal obstruction will force you to become a mouth breather. At night, you can get more cavities because now your mouth is all dry. You can't humidify the air. Our noses are amazing because no matter what environment we're in in the world, by the time it gets down to your trachea, it's always the same humidification and the same temperature. So you could be in the Arctic or in a desert. And the nose conditions that air perfectly. It's got a huge job, it's a huge filter, and you lose all of those abilities that the body normally needs to perform if you're a mouth breather.