If your tooth is beginning to give you pain, or if it's broken, you might need a root canal. Sometimes root canals are done to prevent pain when a tooth has a large area of decay or a large existing restoration which is failing. Strong and effective dental anesthetic is used to keep you comfortable. Using a series of instruments, the nerve of your tooth is carefully cleaned out and the inside of your tooth is cleaned to remove infection and prevent future issues. A rubber like filling material, called gutta percha, is placed inside the tooth to seal out bacteria.