I got a root canal about 4 years ago. Recently it began hurting and only when I eat room temperature, chips, or hot stuff such as soup. It's half of a tooth and still works fine. I brush at least twice a day and food continuously gets stuck, that's when the pain happens. When I eat chicken, or hamburger meat, ribs, anything in that sort it causes pain to my root canal. What should I do, because I have no money for a dentist. I am homeless for the time being. I also recently got new fillings before I became homeless and they are still sensitive to the things I eat. Will that subside?