Root canals treat diseases or abscessed teeth. Root canal treatment is the process of removing the infected, injured or dead pulp from a tooth. Once a tooth is injured, cracked or decayed, it is necessary to open the tooth and clean out the infected tissue in the centre. This space is then filled and the opening sealed. Keeping your tooth helps to prevent your other teeth from drifting out of line and causing jaw problems. Saving a natural tooth avoids having to replace it with an artificial tooth.