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Mouth breathing refers to the state of inhaling and exhaling through the mouth.
A healthy individual normally breathes through the nose while resting or doing light exercise, and breathes simultaneously through both the nose and mouth during vigorous aerobic exercise, in order to supply sufficient oxygen.
Mouth breathing in children can be a cause of abnormal facial growth primarily in the upper and lower jaw shape, leading to Long Face Syndrome or other malocclusions.
- ^ R.M. Rubin, Mode of respiration and facial growth. Am. J. Orthod. 78 (1980), pp. 504–510.