Some 7 to 8 years back, I had root canal done. While doing the procedure, the doctor might have exerted some pressure and the file broke in the root. She never told me about this. Now I have left the city. I started feeling some sensitivity in that tooth. So I went to another dentist to gave the procedure done again. He found out thus and told me. He says it cannot be removed. I want an opinion on it. Can the needle be removed for the root canal? I still have the sensitivity in the tooth.