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Less commonly, an unpleasant sweet taste in the mouth could be caused by a dietary deficiency. A zinc, folic acid or vitamin B deficiency could contribute to changes in taste.(7,8,9) Usually, when sweet taste in the mouth occurs on its own and disappears in a couple of days, itâs not to be considered a major problem.
It is also important to differentiate if the taste is truly salty, or if it is more metallic in nature. A metallic taste is usually caused by bleeding in the mouth or as a side effect of a medication. A salty taste on the lips, and in the mouth can have a wide range of causes, some very common, some very rare.