Endodontic treatment basically refers to root canals. When a tooth has had irreversible damage to the nerve, there are only two options: either the tooth has to be extracted, or an attempt can be made to save the tooth via a root canal. In a root canal, our goal is to clean out all the dead and dying material from inside the tooth and refill the canals to prevent reinfection by bacteria. This is where using a microscope really helps the result, as some of those canals are so hidden that trying to find them without a microscope would be like finding your keys in the dark.
Root canals (endodontics) involve several considerations, and sometimes a tooth is better off being extracted than being saved. For every root canal contemplated, we must also look at how much original tooth remains, as well as its periodontal (gum) condition and the relevant biting forces on the tooth. The attached photos of a root canal case are x-rays, because externally, a tooth looks basically the same before and after a root canal. You will see on the image that the inside of the tooth is filled up from top to bottom .