Vitamin B12 is essential for healthy oral tissues. Its deficiency can affect the mouth early.., Oral effects , red,smooth,painful tongue(glossitis), recurrent mouth ulcers , burning mouth Altered Taste ChemoExperts 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: What causes a metallic taste in the mouth?
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metallic taste in mouth after b12 injection Do others experience side effects from vitamin B12 supplements?