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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.
In addition, people with diabetes often complain of bad breath and bitter, metallic, or sour tastes. The bacteria that cause bad breath, taste disturbances, and dry mouth produce sulfide molecules particularly at the back of the tongue â an acidic, sugary, dry, anaerobic environment where bacteria thrive. If left untreated, dry mouth can lead to many oral health issues including gingivitis and gum disease.