It is not possible to generalize whether root canal treatment can be done in one session. For those with secondary space infection, acute periapical abscess requiring incision and drainage, and those with severe pain on percussion, one-time root canal treatment is not suitable.
One-time root canal treatment is suitable for most cases that require root canal treatment, but for those who have acute periapical abscesses that require incision and drainage, patients with secondary interstitial infections, patients with severe percussive pain, oozing in the root canal that cannot be dried right away, complex cases that are too time-consuming to be completed at one time or patients who cannot tolerate cooperating with prolonged maneuvers, it is not possible to perform one-time root canal treatment.
When root canal treatment is needed, you should go to a regular hospital and choose the appropriate treatment under the guidance of your doctor.