Q. I have had a gold crown for 30years and recently the back edge has moved away from the gum. A year ago my dentist eased it down and filled it. Last week he again filled it with amalgam,this was uncomfortable interfered with my bite and broke and fell out after 4 days. He is worried that the tooth will break if he takes off the gold crown as he doesn’t know what is underneath. What are my options. Should I ask for an x ray?