Root canal therapy is one of the dental treatments most surrounded by myths. Many patients arrive at the consultation with fear, outdated ideas, or contradictory advice they heard in the family, on social media, or in a clinic 20 years ago. We close Save Your Tooth Month by clarifying the 7 myths we hear most at Clínica Endodontics — with updated evidence so you can make well-informed decisions.
"A root canal is one of the most painful treatments out there."
False. This belief comes from decades ago, when anesthesia and instruments were very different from today's. Today, a well-performed root canal feels just like a regular filling — most patients report zero pain during the procedure. Studies published in the Journal of Endodontics show that significant post-operative pain occurs in less than 10% of cases and usually resolves in 24-48 hours with common pain relievers. What people remember as "root canal pain" is usually the previous pain from the inflamed pulp, not from the treatment itself.
"It is better to extract the tooth than to have a root canal."
False in most cases. The natural tooth, even after a root canal, retains proprioception (the ability to sense biting pressure), maintains the alveolar bone physiologically, and is less expensive in the long run than extraction followed by an implant or bridge. Modern root canals performed by a specialist have success rates above 90% at 10 years. Only when the tooth has a vertical fracture, severe bone loss, or insufficient tooth structure is extraction the right option.
"A root canal kills the tooth."
Technically false. What is removed during a root canal is the pulp tissue (the nerves and blood vessels inside the tooth), but the tooth doesn't "die": it remains supported by the periodontal ligament, retains its root, its enamel, its dentin, and most of its function. It is still your tooth. What changes is that it no longer responds to thermal stimuli as before, because it no longer has pulp.
"Root canals cause cancer or other diseases."
False. This is probably the most dangerous misinformation in circulation. It originates from a study by Dr. Weston Price published in 1923 — more than 100 years ago — whose methods do not meet any current scientific standard. Numerous modern studies, including research published in JADA and reviews from the American Association of Endodontists, have completely refuted that supposed connection. There is no valid evidence linking root canals with cancer, heart disease, autoimmune conditions, or any systemic pathology. The original source has been refuted by the scientific community itself.
"If it doesn't hurt, I don't need a root canal."
False. Many teeth that need a root canal show no pain. This happens when the pulp has already become completely necrotic — when it dies, it stops sending pain signals, but the infection continues advancing toward the root and bone. That's why findings on routine X-rays are common: asymptomatic apical lesions that need treatment. Waiting for pain can mean losing bone, developing abscesses, or reaching the point of no return where the tooth can no longer be saved.
"A root canal takes many appointments."
False in most cases. With modern technology — nickel-titanium rotary systems, electronic apex locators and microscopes — most root canals are completed in 1 or 2 appointments of approximately 60-90 minutes. Only specific cases with active infection, resorption, or complex anatomy may require more visits. The idea of "5 or 6 appointments" corresponds to an earlier era with limited instruments.
"A root canal is very expensive — an implant is a better deal."
False if you compare correctly. At first glance an individual root canal can seem expensive, but the correct calculation compares the complete treatment of each option. A root canal plus a protective crown usually costs less than the sum of extraction + bone graft (frequently needed) + implant + implant crown. And total time: a root canal is completed in 1-2 appointments in the same week; an implant requires 3 to 6 months of osseointegration before the crown. Consider both factors before deciding.
How to tell reliable information from misinformation
If you are going to research about root canals, look for sources that meet these criteria:
- Professional associations: American Association of Endodontists (AAE), American Dental Association (ADA), Latin American endodontic federations.
- Peer-reviewed studies: published in Journal of Endodontics, International Endodontic Journal, JADA.
- Certified specialists: endodontists with postgraduate training, not just opinions from the internet or social media.
- Up-to-date information: publications from the last 10 years. Endodontics has changed dramatically — an article from 1995 no longer represents current clinical reality.
What is true
To wrap up, these are statements that do have scientific support:
- A root canal with a microscope has a better prognosis than without one.
- A root-canaled tooth generally needs a protective crown, especially if it is a molar or premolar.
- The professional's specialization matters: endodontists treat these cases daily and handle complications a general dentist may not have seen before.
- A well-done root canal can last the patient's entire life.
- Digital radiography and 3D scanning (CBCT) when needed have transformed the diagnosis of complex cases.
If you have doubts, ask before you believe
Every month we receive patients who arrive with fear or wrong ideas that cost them time, money, or a tooth. The best decision is made with correct information and a second opinion from an endodontist when needed. At Clínica Endodontics in San Miguel we devote time at every consultation to explaining the case, showing the X-rays, and answering questions — with no obligation to follow up with treatment.
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