An endodontist is a dentist who has completed two or more additional years of specialized training focused on diagnosing and treating tooth pain, performing root canals, and saving damaged teeth. All endodontists are dentists, but less than three percent of dentists are endodontists. In the United States, there are roughly 5,700 practicing endodontists compared to nearly 160,000 general dentists.
How Their Training Differs
Both general dentists and endodontists complete four years of dental school and earn a Doctor of Dental Surgery (DDS) or Doctor of Dental Medicine (DMD) degree. After that, their paths split. A general dentist can begin practicing immediately, while an endodontist enters a residency program lasting two to three years depending on the institution.
That residency is intensive. At UCSF’s program, for example, residents spend 70 to 80 percent of their time in clinical work, with 9- to 10-hour days plus significant reading outside of clinic hours. By the time they finish, they’ve completed roughly 200 root canal cases and 20 surgical procedures under supervision. The remaining time goes to lectures, emergency and trauma treatments, consults, and teaching. This volume of focused practice is what separates an endodontist’s skill set from a general dentist who handles root canals as just one part of a much broader workload.
What Each One Actually Does
A general dentist is your primary oral health provider. They handle cleanings, fillings, crowns, bridges, extractions, gum care, and overall dental health. They also perform root canals, though for most general dentists, root canals make up a small fraction of their weekly schedule, typically around two per week.
Endodontists, by contrast, don’t place fillings or clean teeth. They dedicate their entire practice to the interior of the tooth: diagnosing the source of tooth pain, performing root canals, retreating root canals that haven’t healed, and performing surgical procedures on the root. An endodontist averages about 25 root canal treatments per week. That level of repetition builds a depth of expertise that’s hard to replicate in a general practice setting.
Endodontists also specialize in tracking down pain that’s been difficult to diagnose. Tooth pain can be tricky because it sometimes radiates, making it feel like the problem is in a different tooth or even in your jaw or ear. The combination of specialized training and advanced imaging gives endodontists tools to pinpoint the source.
Technology You’ll Find in an Endodontist’s Office
Two pieces of equipment set most endodontic offices apart from general dental practices: operating microscopes and 3D imaging.
Dental operating microscopes provide high magnification and bright illumination inside the tiny canals of a tooth. Root canals can be narrower than a pencil lead, and some teeth have extra canals that are easy to miss on a standard X-ray. A microscope helps the endodontist find and treat every canal thoroughly.
The other key technology is cone beam computed tomography, or CBCT, a type of 3D scan. Standard dental X-rays produce a flat, two-dimensional image, which can make it hard to see overlapping roots, hidden fractures, or infections nestled behind bone. A CBCT scan creates a three-dimensional view of the tooth and surrounding bone, showing anatomy in slices from every angle. This is especially useful for complex cases where a 2D X-ray doesn’t tell the full story. Some in the field consider 3D imaging the standard of care when detailed visualization is needed.
Root Canals and Beyond
Root canal treatment is the bread and butter of endodontics. The procedure removes infected or damaged tissue from inside the tooth, cleans and shapes the canals, then seals them to prevent reinfection. Most general dentists handle straightforward root canals without any issues. Where endodontists become especially valuable is with complicated anatomy (curved roots, calcified canals, teeth with unusual numbers of canals) or cases that haven’t responded to initial treatment.
When a root canal doesn’t fully resolve an infection, or when infection returns, an endodontist may perform a retreatment, reopening the tooth to clean and reseal it. If that still isn’t enough, the next step is typically an apicoectomy, sometimes called root-end surgery. During this procedure, the endodontist makes a small incision in the gum to access the tip of the tooth’s root directly, removes the infected tissue, and seals the root tip from the outside. This approach reaches areas that are impossible to treat from inside the tooth.
Success Rates: Does the Specialist Matter?
The short answer is yes, particularly for complex cases. One study comparing outcomes found that teeth treated by endodontists had a 98.1% success rate, while those treated by general dentists had an 89.7% success rate. Both numbers are good, but that gap can matter when you’re deciding whether a tooth can be saved or needs to be extracted. For a straightforward front tooth with a single canal, a general dentist’s results are typically excellent. For a molar with curved roots or a tooth that’s already been treated once, the specialist’s edge becomes more meaningful.
Getting and Staying Numb
One reason people dread root canals is the fear that numbing won’t work, and that fear isn’t unfounded for certain situations. Teeth that are already inflamed and painful can be genuinely harder to numb. The inflammation changes how nerve fibers respond to anesthetic, raising the threshold needed to block pain signals. Anxiety also plays a role, lowering your tolerance and making it harder for standard doses to feel effective.
Endodontists train specifically for these difficult-to-numb scenarios. They use a wider toolkit of anesthesia techniques beyond the standard injection. These include injections delivered directly into the ligament around the tooth, injections into the bone itself, buffered anesthetic solutions that work faster, and supplemental medications taken before the procedure to improve how well the numbing agent works. If you’ve ever had a dental procedure where you couldn’t get fully numb, an endodontist’s office is likely better equipped to solve that problem.
When to See an Endodontist vs. Your Dentist
For most people, the path to an endodontist starts with a referral from their general dentist. Your dentist identifies a tooth that needs a root canal, evaluates the complexity, and decides whether to handle it in-house or send you to a specialist. Many dental offices have referral relationships with local endodontists and can get you an appointment quickly, which matters when you’re in pain.
You don’t always need a referral, though. If you’re experiencing sharp or lingering pain, sensitivity to hot or cold that doesn’t go away, pain when chewing, or swelling near a tooth, you can contact an endodontist directly. This can sometimes speed up diagnosis and treatment, especially if you suspect the issue involves a tooth that’s already had dental work.
Think of it this way: your general dentist is like a primary care physician, handling the full spectrum of your oral health. An endodontist is the specialist you see when the problem is specifically inside the tooth and either complex enough or painful enough to benefit from someone who does nothing else all day, every day.