Hiya, I chipped my front tooth 5 years ago and had root canal treatment on it and they then filled my tooth up but it started going black so my dentist suggested a crown.From day one my crown has had a black line above it and my gum area above my tooth is black. I had fluid coming out of my gum so I went to see my dentist which referred me to a dental school in Aberdeen, they sent me back to my dentists and instructed him to take my crown off and leave it open and put a temporary crown on and redo root treatment. I had a new crown put on in august but my gum is still black. Can anything be done to get the dark colour away from my gum area? and why has it turned that colour?