Initial Endodontic procedure to remove infected or damaged tissue and/or abscess. During Endodontic treatment an opening is made through the crown (the top of the tooth). Tiny instruments are then used to remove the damaged tissue from the canals. The canals are then shaped to a form that will be easy to fill. When completely clean and free to infection, the root canals are filled and sealed with a material that prevents bacteria from reentering. The opening made in the top of the tooth is sealed with temporary filling. The temporary filling will be replaced by your regular dentist with permanent filling, or some other protective covering such as a crown.