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Adults can safely consume peppermint as a tea by steeping on teaspoon of the herb in hot water for 10 minutes. Four to five cups of the mix can be consumed each day to alleviate cold symptoms and post-nasal drip, and to help get rid of a metallic taste in your mouth.
Post-Nasal Drip Symptoms. 1  Hoarseness, throat clearing, or coughing. 2  Constant swallowing. 3  The sensation of a lump in the back of the throat. 4  A runny nose and/or congestion (rhinorrhea) 5  Sore throat. 6  Tonsil stone formation (if tonsils are still present) 7  Nausea and fatigue. 8  Severe bad breath. 9  Dry mouth.