Q. Hello Doctor. A few years ago i had root canals on two of my teeth. one of them has began to darken and it is noticable, it is likely the other one will do the same. its started to take over my life i feel like everyone notices! do you know how i can fix this? could it be done on the NHS? i am a student in public administration and i feel its going to effect my career if not sorted soon. thanks for the help