They told me based on my X-rays that I have a few cavities. Once they began addressing these cavities, they said they would need to do an emergency root canal. One of the teeth was worse than they thought. I had no pain in my teeth prior to this nor indication of infection. My tooth has been hurting since the root canal (2 sittings and over 4 hours). I researched root canal after and realized what a huge deal it is. Based on attached x-rays, did I need the root canal or do I have other cavities?