Hi! I have a big filling on my left molar for a long time. The tooth is aching now and radiates to other teeth and sometimes to my eye and ear. I went to the dentist and she said that x-rays are clear, not cavities or infection. She thinks i need to put a crown on the tooth since the filling is too big. But I am wondering - if I put a crown on a problem, how will it solve it? Or when she does a crown, she will take out the filling and clean the inside? Will the crown help it? What if I need a root canal and I have a crown on the tooth? Why is there nothing on the xray? Can it be cavity under the filling that we cant see? I do not want to pay for crown if it doesnt solve the problem, but this constant ache doesnt let me live normally and focus on other things. Thank you!!!