It is perfectly natural to breathe through your mouth at certain times, such as when lifting a heavy load or exercising.
Breathing through the mouth most of the time, however, can cause health problems. These problems can be especially severe for children because it can affect the long-term development of the face.
Sleeping Disorders are Caused by Mouth Breathing
Author Patrick McKeown
From the channel ButeykoDVD.com
► SLEEP APNEA - Dr. Zack Zaibak
► VIDEOCONFERENCING: Sleep Medicine Oral Appliances and Orthodontic Treatments for Children