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There could be increased saliva production due to many causes. It could be increased acidic reflux, stone in salivary gland
. Avoid spicy food. Eat more bland, soft, cool food like yoghurt. Stop smoking
and drinking alcohol. Eat plenty of fresh fruits and vegetables. Don't lie down immediately after eating food. Lie at an angle of 45 degrees after eating food and then lie down flat on bed 2 hours after food. Get a consult with ENT Surgeon and get a thorough checkup for proper management according to the cause.