Therefore, summarizing and collating all this information, we come to the following conclusion: In order to obtain the highest endodontic success rate and least amount of postoperative complications, the obturation material should be placed anywhere between the constriction and the anatomic apex.

Where does the tooth root end?

The Roots of Our Teeth

In addition to being shielded from harmful bacteria by the gum tissue, roots have built-in armor called cementum, a hard, calcified substance that coats their surfaces. The tip of each root ends in a tiny hole through which blood vessels and nerves can access the inside of the tooth.

What happens if you overfill a root canal?

If the tooth was not infected around the tip of the root, that's when overfilling is likely to cause pain after a root canal. It's rare, but a tiny bubble of air can also be forced out of the root tip, causing pressure and pain. It may take some time, but the pain in either case should subside on its own.