We all know what it’s like to have a cold, with a nose so stuffy that you can’t breathe through it.
At times like that, we breathe through our mouths instead, and that’s pretty much how it should work. Mouth-breathing is an emergency backup, not the default.
There are many negative effects of mouth-breathing full-time, particularly if the habit begins in childhood.
Many things can lead to a mouth-breathing habit. A small child might get a cold and then simply continue breathing through his mouth when his nose clears.
A problem with bite alignment can make it difficult to keep the mouth closed.
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