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The Truth Between Root Canals and Cancer (3 Other Myths)

La verdad entre las endodoncias y el cáncer (otros 3 mitos)

Dr. Andreas

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Written by

Q.F. Nayibe Cubillos Morales


Medically Reviewed by

Dr. Gustavo Assatourians D.D.S

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❙ Our team of writers, editors, and medical experts rigorously evaluates each article to ensure the information is accurate and exclusively cites reputable sources.

❙ We regularly assess how the content in this article aligns with current scientific literature and expert recommendations in order to provide the most up-to-date research.

Root canal treatment, also known as endodontics, is a dental procedure that involves removing diseased or damaged tissue from inside a tooth and then replacing it with artificial material. This procedure is often used to treat teeth that are infected, decayed, or otherwise damaged. But, some people claim root canals and cancer have a connection with each other.

It has been hypothesized that there may be an association between endodontics and cancer. The exact cause of this link is still unknown, but it is believed that bacteria present in the root canal may be responsible for this consequence since the root of the tooth is connected to the nerves in the mouth.

The bacteria present release toxins that travel through those nerves into the bloodstream, then spread and presumably become cancerous.

This article will explain what an endodontic treatment is, how likely it is that root canal treatments will cause cancer, and other myths about this treatment.


What is a root canal?

A root canal treatment is a common dental procedure used to treat teeth damaged by decay, trauma, or infection.
The tooth is made up of 3 layers:

• Enamel: The outermost area is the hardest tissue of the human body. If you want to know more about enamel, you can visit our article here.

Dentin: Intermediate zone that lies between the enamel and the dental nerve.

• Pulp dental: the innermost tissue that contains nerves, blood vessels, and connective tissue cells. It is located along the roots of the teeth in an area known as the root canal. 

root canals and cancer

If a cavity or trauma affects the enamel or dentin, it is unlikely that an infection will develop. But when that damage affects the dental nerve, bacteria easily enter the root canal, causing an infection and subsequent nerve death.


Symptoms of a dental infection

• Pain when biting and chewing

• Increased sensitivity when eating food or drinking hot or cold drinks

• Loose teeth

• Swelling and redness of the gum

• Abscess in the gum near the tooth (with pus)

• Swelling of the face

• Throbbing pain in the tooth

When the dental nerve is affected, one or more of these symptoms may occur. If this is the case, it is necessary to carry out an endodontic surgery or treatment, which consists of extracting the infected dental nerve from the inside of the tooth, cleaning and disinfecting the root canal, and finally filling it with a special material.

After this process, a restoration is made to prevent problems from occurring in the future. The goal of a root canal treatment is to save the tooth, preserving its natural structure and function. It is a safe and effective way to keep the tooth and eliminate an existing infection.


Can root canals cause cancer?

There is no evidence that root canals cause cancer. This myth began in the 1920s when a dentist named Weston Price carried out a series of experiments and published essays with the results obtained. He related root canals to the appearance of cancer. 

root canals

The teeth after treatment still contain harmful toxins that, in his opinion, travel to other areas of the body and contribute to the development of cancer and other diseases.
This study was poorly designed, so its results are not reliable. Some of the defects were:

• Little control of the conditions of the experiments.

• Tests were performed in non-sterile environments.

• No investigator has been able to recreate the results of the study.

• It did not involve the use of control groups and the other standard requirements of a modern scientific study.

Later in 2019, a documentary on Netflix called “RootCausee” generated great commotion. It explained the theory of focal infection, in which bacteria are transported through the bloodstream from distant places and generate multiple systemic problems, including cancer.

The documentary claims that 97% of breast cancer patients had an endodontically treated tooth on the same side of the jaw.


The truth about root canals and cancer

The AAE (American Association of Endodontists) published an article about the safety of root canal treatments. Points to highlight are:

1. Every year 25 million root canal treatments are performed around the world effectively and safely. If it were true that root canals cause cancer, there would be much more scientific information about it, and it would not be the treatment of choice to save teeth.

2. There is no valid scientific evidence linking root canal treatment to diseases in other parts of the body. It is true that some people with cancer may have had a root canal at some point in their lives. but it does not mean that this procedure is related to the development of cancer.

3. In 2013, a study published in a journal of the American Medical Association (JAMA Otolaryngology—Head & Neck Surgery) found that a patient’s cancer risk does not change after undergoing root canal treatment. The author even mentions that people who had undergone multiple root canals were less likely to have head and neck cancer.

4. Technological advances in medicine have made root canal treatments more predictable and successful today. 

root canal surgery


Other myths about root canals

1. Root canals are painful: This treatment does not cause pain; on the contrary, it removes it. Anesthetics are used to make the procedure as comfortable as possible.

2. Extractions are preferable to root canals: Saving the tooth is the best option. Every missing tooth must be replaced, which is costly and time-consuming; If not replaced, it can create a collapsed bite.

3. Root canal treatments cause other diseases such as Alzheimer’s: It is not possible to contract a disease from having a root canal; this theory is unfounded and cannot be validated.

The bacteria found around a root canal-treated tooth are the same as those found throughout the mouth, so there is no valid, scientifically proven reason to say that root canal treatment causes diseases such as cancer.
It is normal to have doubts and ask questions about this type of treatment.

Ideally, seek information from reliable and scientifically backed sources and always consult a dentist about this and other questions you have.



1. American Association of Endodontists. (November 15, 2022). Myths About Root Canals.

2. American Association of Endodontists. (2014). Root canal safety talking points. AAE.

3. Ames, H. (March 23, 2020). Root canal procedures do not cause cancer: This is why. Medical news today.

4. Assatourians, G. (Updated October 30, 2022). The Truth About Root Canal And Cancer. Channel Islands Family Dental Office.

5. Canadian Cancer Society. (s. f) Do root canals cause cancer? CCS.

6. Snyder, A. (March 15, 2019). Root Canals and Cancer. Healthline.

7. Tezal, M., Scannapieco, F.A., Wactawski-Wende, J., Meurman, J.H., Marshall, J.R., Rojas, I.G., Stoler, D.L., & Genco, R.J. (2013).Dental Caries and Head and Neck Cancers. JAMA Otolaryngology–Head & Neck Surgery, 139(10), 1054.

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