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It's possible there is excessive saliva production and the air blown out churns the saliva and causes bubbles. Does the person snore a lot at night. Does he/she have abdominal pain, excessive gas and central burning chest pain. It could be related to gastritis. Kindly consult a Doctor if he has any of the above mentioned problems to get examined and treated correctly.
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Why Does A Person Foam From The Mouth While Sleeping ?
it is a normal phenomena in some persons,no need of treatment.