Q. I have a gold crown in one of my molars and the tooth underneath is discoloured. I don’t know if I had root canal treatment in that tooth or not. It’s not yellow or grey, but an even, brown colour over the whole area that can be seen – is it likely to be just discolouration rather than decay? I don’t have any pain or problems with it. I’m going to have my dentist look at it in two weeks but I’m a very anxious patient so wondered if you could warn me what I might expect.,