A mouth-breather describes a person who habitually breathes air through their mouth.
Breathing through the mouth can have some surprising health problems.
We all know how uncomfortable it is when we get a cold and a stuffy blocked nose. We become mouth-breathers! It is difficult to sleep, our mouths dry-out, and our breath smells!
When the cold is gone, nasal breathing should return to normal. However if mouth breathing continues and becomes a habit for whatever reason, many health problems can occur.