Smell from mouth unlikely from Rct or tooth removal. As far as rct is completed and extracted teeth wound healed completely. There can be dental and systemic reasons for smell Also habits such as smoking or use of chewable tobacco could be attributed to it.

Root canal treatment is done for teeth infections and bad breath is most commonly associated with gum inflammation. These are two independent pathologies which can occur concomitantly in the same patient. The number of treatments depend upon the number of problems so you should get every problem diagnosed first so that the right treatment for each can be explained to you. Post operative maintenance by the patient by meticulous oral hygiene is equally important so that new problems do not occur, because prevention is always better than cure. Regards