Root canal treatment is a treatment for the pulp and nerve of a tooth. It’s often used for infected, decayed, or painful teeth. The treatment includes removing the diseased tissue and any infected tissue in the root canals of the tooth. Then, the root canal is cleaned and filled with a restorative material, like an amalgam. Root canal treatment is used to remove infected and decayed teeth from the root canal. Infected teeth may be filled with bacteria that can cause an infection, abscesses, and severe pain. In some cases, teeth may also need to be removed. This treatment is most often done in dentists offices, but it can also be done at home.