Q. I have a discoloured front tooth due to a dead nerve. I have had it for about 30 years. The tooth is strong and at the moment I have a porcelain veneer over it. It is about 15 years old and the discolouration is now showing through again. I go to my dentist twice a year and I have asked if there are any new techniques available to improve it. He told me that I would need a thicker veneer to cover the tooth and it wasn’t really worth doing. What would you suggest I ask him to do? Many thanks.,