A root canal involves six steps: imaging, anesthesia, isolation with a rubber dam, removal of infected pulp (the nerve tissue inside the tooth), cleaning and shaping of the root canals, and sealing with a biocompatible filling. Most procedures finish in a single 60-to-90-minute appointment. You should feel no pain during treatment — only mild pressure.
A root canal procedure involves six main steps: imaging to map the tooth’s anatomy, local anesthesia to ensure complete comfort, isolation of the tooth with a rubber dam, removal of the infected or inflamed pulp tissue, thorough cleaning and shaping of the root canals, and sealing the canals with a biocompatible filling material. Most procedures are completed in a single appointment, and many take roughly one to one and a half hours depending on the tooth. You should feel no pain during treatment, only mild pressure or movement.
For many patients, the anxiety around a root canal comes from not knowing what happens during the procedure. The imagination tends to fill in the blanks with something far worse than reality. Understanding each step, what your endodontist is doing and why, removes the unknown and replaces it with something much less intimidating: a methodical, well-controlled procedure that ends your pain.
Step-by-Step: What Happens During a Root Canal
3D Imaging and Treatment Planning
Before any instrumentation begins, your endodontist reviews your 3D CBCT (cone-beam CT, a low-dose 3D X-ray that lets us see the tooth and bone from every angle) scan to map the exact number, shape, length. Curvature of your root canals. This eliminates surprises during treatment. A tooth that looks straightforward on a conventional X-ray may have a curved canal, an extra canal, or a periapical (relating to the area surrounding the very tip of a tooth’s root) lesion (an area of infection and bone damage at the tip of a tooth’s root, visible on X-rays) that only the 3D scan reveals. Because the shape and number of canals vary so widely from one tooth to the next, this planning step directly affects the instruments chosen, the approach taken, and the time allocated for treatment.
Local Anesthesia
You will receive a local anesthetic injection to fully numb the tooth, surrounding gum, and bone. At most Mid-Florida Endodontics locations, we use The Wand, a computer-assisted delivery system that releases anesthetic slowly and gently, making the injection itself far more comfortable than a traditional dental syringe. Your endodontist will confirm you are completely numb before proceeding. If at any point during treatment you feel discomfort, raise your hand and additional anesthetic will be given.
Rubber Dam Placement
A thin rubber sheet called a dental dam is placed around the tooth, isolating it from the rest of the mouth. This serves two critical purposes: it keeps the treatment area dry and free of saliva (which contains bacteria), and it prevents any irrigating solutions or tiny instruments from being accidentally swallowed. Keeping the field clean and dry this way supports the disinfection that follows. Most patients find the rubber dam comfortable once in place, and some even find it reassuring, nothing gets in or out of the treatment area unintentionally.
Access Opening and Pulp Removal
A small opening is made through the top of the tooth to access the pulp (the soft living tissue inside the tooth, containing nerves and blood vessels) chamber (the hollow space inside the crown of the tooth that houses the nerve and blood vessels) beneath. Under high-magnification surgical microscope, the pulp tissue is removed from the chamber and each canal. The magnification allows the endodontist to see canal orifices, tissue remnants, and features that are very difficult to see with the naked eye, helping ensure nothing is missed.
Canal Cleaning, Shaping, and Disinfection
This is the most technically demanding part of the procedure. Flexible nickel-titanium rotary instruments are used to clean and shape each canal to a precise taper, removing infected tissue and creating smooth walls for the final seal.1 Shaping the canal in this controlled way also creates the space needed for irrigating solutions to do their work.2 Throughout this process, antimicrobial irrigating solutions, most commonly sodium hypochlorite, are used to flush debris and disinfect the canal system, including areas instruments cannot physically reach.3 Ultrasonic instrumentation is used to activate these solutions and help them spread throughout the canal. Electronic apex locators measure canal length so each canal is cleaned to its full extent without overfilling.
Canal Filling and Sealing (Obturation)
Once the canals are cleaned, shaped, and disinfected, they are filled with a biocompatible material called gutta-percha (a natural rubber-like material used to fill and seal root canals after treatment), a natural rubber-like substance that has been used in root canal treatment for well over a century and remains the long-standing standard for canal obturation (the step where cleaned root canals are filled and sealed to prevent bacteria from re-entering). Using precise, provider-selected sealing techniques, the gutta-percha is placed to completely fill the canal space three-dimensionally and sealed with a specialized cement to create a leak-resistant barrier against bacterial re-entry. A well-sealed canal and a sound coronal restoration together give the tooth its best long-term outcome.4 A temporary or permanent filling material is then placed over the access opening, and your general dentist is notified to schedule the permanent crown.
The Technology Behind a Modern Root Canal
What Mid-Florida Endodontics Uses on Every Case
- 3D CBCT imaging maps the full three-dimensional anatomy of each tooth before treatment begins
- Surgical operating microscope high magnification for canal identification, tissue removal, and crack detection
- The Wand computer-assisted anesthesia computer-controlled injection rate for a gentler numbing experience
- Nickel-titanium rotary instruments flexible, efficient canal shaping with reduced risk of instrument separation
- Electronic apex locator (an electronic device that precisely measures the length of a root canal, accurate to fractions of a millimeter) precise canal length determination without additional X-ray exposure
- Ultrasonic instrumentation used for advanced irrigation activation, troughing (using an ultrasonic instrument to carefully remove a thin groove of tooth structure to locate hidden root canal openings) to locate canal orifices, post and instrument retrieval during retreatment, and access refinement
- Advanced obturation techniques gutta-percha placed and sealed using precise, provider-selected methods that achieve a dense, leak-resistant three-dimensional fill of the canal system
What You Will Feel During a Root Canal
With effective local anesthesia, you should feel no sharp pain during a root canal. What patients typically experience:
- Pressure from instruments working inside the tooth; this is normal and not painful
- Vibration from rotary instruments shaping the canals
- Jaw fatigue from keeping your mouth open for an extended period
- Mild awareness some patients feel a vague sense that something is happening without any discomfort
If you feel anything that resembles pain, raise your hand immediately. Additional anesthetic can almost always resolve it. Anesthetizing infected teeth can occasionally require supplemental injections, experienced endodontists anticipate this and are prepared. This is one reason a specialist’s training and equipment matter for a comfortable, predictable visit.
Modern root canal treatment is built on careful canal shaping followed by thorough disinfection and sealing. A review in the Journal of Endodontics describes how flexible nickel-titanium rotary instruments shape canals predictably, while noting that clinical trials are still needed to confirm long-term outcome differences between techniques.1 What the outcome evidence does show is consistent: a large systematic review and meta-analysis found that root fillings reaching close to the canal tip with no voids, plus a sound coronal restoration, significantly improve healing of the tissue around the root.4 A more recent systematic review using 3D CBCT imaging reported high pooled healing rates after primary root canal treatment, reinforcing that well-performed treatment reliably resolves infection at the root.5 Advances in irrigation activation and obturation materials continue to refine these results further.
Works Cited
- Peters OA. Current challenges and concepts in the preparation of root canal systems: a review. J Endod. 2004;30(8):559-567. doi:10.1097/01.don.0000129039.59003.9d
- Hülsmann M, Peters OA, Dummer PMH. Mechanical preparation of root canals: shaping goals, techniques and means. Endod Topics. 2005;10(1):30-76.
- Jaiswal N, Sinha DJ, Singh UP, Singh K, Jandial UA, Goel S. Evaluation of antibacterial efficacy of Chitosan, Chlorhexidine, Propolis and Sodium hypochlorite on Enterococcus faecalis biofilm: an in vitro study. J Clin Exp Dent. 2017;9(9):e1066-e1074. doi:10.4317/jced.53777
- Ng YL, Mann V, Rahbaran S, Lewsey J, Gulabivala K. Outcome of primary root canal treatment: systematic review of the literature. Part 2. Influence of clinical factors. Int Endod J. 2008;41(1):6-31. doi:10.1111/j.1365-2591.2007.01323.x Systematic Review
- Brochado Martins JF, Georgiou AC, Nunes PD, et al. CBCT-assessed outcomes and prognostic factors of primary endodontic treatment and retreatment: a systematic review and meta-analysis. J Endod. 2025;51(6):687-706. doi:10.1016/j.joen.2025.03.004 Systematic Review