Ok, so in march I had a tooth filling, a few days later it fell out. Not knowing much about teeth I didn't think much of it. My tooth was sensitive to hot/cold liquids and hurt when I chew hard foods. I began having headaches off and on a few days a week. In May, I suffered a concussion. So I took it easy for a couple of months. I feel as if the concussion is Healed or close to it, as my thinking is back to 100%. But I still have headaches. But there now located in the forehead, temples, and around the ears. As initially after the concussion the pain was on top of my head. And my tooth is still sensitive and hurting. So I decided to stop putting off the pain as concussion pain, and started looking for another cause. A recent mri showed I have a maxillary sinus infection, which I found out can be caused by a tooth infection. My question is, could all this be my tooth? An if so, did I wait too long? I have recently found out the severity of tooth infections and wish I got it checked out earlier. And am known to be paranoid. Thanks for reading.