You have probably seen the claim online: root canals cause heart disease. It pops up in social media posts and wellness blogs, often with dramatic language about "toxic" dental treatments. It sounds convincing. But what does the evidence actually say?

The idea comes from an old theory that root canal-treated teeth harbour hidden infections that spread throughout your body, causing heart problems, arthritis, and other conditions. This theory was proposed in the 1920s and has been repeatedly debunked since. Modern endodontics — the dental specialty that performs root canals — operates on completely different principles backed by overwhelming scientific evidence.

Large-scale studies and systematic reviews have found no credible link between root canal treatment and heart disease. The American Heart Association has stated that dental infections, including untreated tooth decay, are the actual concern — not the treatment. In fact, treating an infected tooth with a root canal removes a source of potential infection, which is arguably protective for your overall health.

Your mouth contains hundreds of bacterial species. Some are harmless. Others contribute to gum disease and tooth decay. The key difference? Untreated infections are the problem. A properly performed root canal eliminates bacteria from the infected root canal system, preventing the infection from spreading.

Correlation gets mistaken for causation. Someone with heart disease might also have had a root canal in their past. That does not mean one caused the other. Both are common, especially as people age. The real risk factors for heart disease are well-established: smoking, high blood pressure, poor diet, and lack of exercise.

If your dentist has recommended a root canal, they are not putting your heart at risk — they are saving a tooth that would otherwise become a genuine source of infection. The alternative, extracting the tooth, carries its own risks and introduces other problems with chewing and jaw bone health.

Trust your dentist recommendation. If you have concerns, ask them to explain exactly why the root canal is needed and what happens if you do not do it. A good dentist welcomes those questions. And if you are still uncertain, you are always entitled to seek a second opinion — that is not a sign of distrust, it is a sign of engaged patient care.

Root canal treatment has a success rate of over 95%. It is one of the most studied and refined procedures in dentistry. The claim that it causes heart disease simply is not supported by the science.