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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.
Problem with the airways. A cold, sinus infection, runny nose from allergies (allergic rhinitis) or nasal polyps can all cause a metallic taste in the mouth. The links will take you to more information on these conditions. A wide range of medication can cause a metallic taste in the mouth as a side effect.