I had a crown put on a tooth last November and it has hurt ever since. It is very sensitive to cold. While doing this the dentist's tool slipped and hit my tooth underneath the one being crowned. It knocked the filling loose and I couldn't stand the pain anymore. So almost 3 weeks ago he did a root canal on that tooth. I have experienced terrible pain on the top and bottom of my teeth and gums since. The pain is now going toward my front teeth and ear. Antibiotics and Ibuprofen are not working at all. Warm compress helps but doesn't make it go away.