When the breath is taken through the mouth, there is nothing from mouth to lungs to strain the air, or to catch the dust and other foreign matter in the air.

From mouth to lungs the dirt or impure substance has a clear track, and the entire respiratory system is unprotected.

And, moreover, such incorrect breathing admits cold air to the organs, thereby injuring them.

Inflammation of the respiratory organs often results from the inhalation of cold air through the mouth.

The man who breathes through the mouth at night, always awakens with a parched feeling in the mouth and a dryness in the throat.