My dentist is NHS and they didn't take kindly to me asking for the X-ray! She did say it didn't show up anything. I'm a bit worried about asking again for it as it seems to annoy her and it's hard to find an NHS dentist. I have no problems with biting down on the tooth and the dentist didn't say anything about gum recession. I have always has regular check-ups and I am very careful about brushing and flossing. She said when I reacted to the cold test, it meant the nerve was dying and it would only get worse. It just seems a bit extreme to be jumping to a root canal! But then, I'm not a dentist. I've made an appointment with a different private dentist for tomorrow as I'd like a second opinion. It just made me nervous the way the dentist today was so keen to to a root canal on the spot! She didn't say anything about tooth grinding but my last dentist did say I clench my teeth but don't grind them.