You could have some abnormality in your sinuses that cause this. For instance, a deviated septum or broken nasal septal bone blocking the way. It could just be the way your brain is programmed. You could buy a strap used to prevent mouth breathing that keeps your mouth closed while you sleep. Check with an ENT if you are concerned. They can definitely help you get an idea of the cause of this.
Answered Oct 24, 2017
is Chin-Up Strip They are designed to re-direct breathing through the nasal passages to provide a training nasal breathing.
Answered Jun 7, 2015
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