Hi. I ve had this problem before, but getting two crowns that I needed and a round of antibiotics made it go away. However, it is back and I have no dental issues. I just had a dental CT to rule out any dental issues. I have a discolored tongue (yellowish in color). I don t have bad breath, but my mouth is dry and water, in particular, tastes metalic to me. I don t like how it looks, and the metallic taste is recent (last few days), but the discolored tongue started a couple weeks ago.