Metallic Taste in Mouth: Causes, Misconceptions, Treatment, and More A metallic taste in your mouth can be a sign of conditions ranging from gingivitis and pregnancy to dementia and kidney failure. What to know: A metallic taste or constant dry mouth are symptoms you should never ignore. These issues can often signal underlying medical or oral health concerns. Low saliva allows bacteria to grow which Supplements and Deficiencies That Can Cause Metallic Taste in Mouth