i'd be more concerned with the effect of mouth breathing on your teeth and the mouth and teeth of children more particularly.
When our mouth is open during breathing the PH balance is altered and the teeth dry out whereby the saliva is no longer coating the enamel on your teeth thus increasing dental caries (cavities), the tongue is in the incorrect position resulting in increased irregularities in jaw and teeth positioning and formation. Jaw tends to form elongated and narrow also causes difficulties with obstructing the passages in the roof of the mouth.
Lots of studies ongoing in this area and increased interest from orthodontists worldwide.....
they find that people who continue to mouth breathe after corrective teeth straightening end up with crooked teeth and are now training people to nasal breathe to improve the effectiveness of their work.
My theory on it, suggests that switching to nasal breathing as a preemptive action may improve the chances of having better and straighter teeth thus not requiring correction in the first place. Particularly for kids as they are still growing....
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