Root Canal Treatment: Separating the Reality from the Reputation

This is perhaps the most persistent misconception in dentistry. The association between root canals and pain likely developed when the procedure was performed with older anaesthetic techniques and less refined instruments. Today, local anaesthesia reliably numbs the treatment area, and most patients report that the experience feels similar to having a tooth filled. A 2016 survey published in the Journal of Endodontics found that patients who had actually undergone root canal treatment rated the experience far less painful than those who had never had one — suggesting the fear is largely anticipatory. The dentist or endodontist (a specialist in tooth pulp and root procedures) will not proceed until the area is fully numb.

Natural teeth have advantages that no replacement fully replicates — they provide the most efficient chewing function, help maintain jawbone density, and keep neighbouring teeth properly aligned. When a tooth is extracted, the gap it leaves can allow adjacent and opposing teeth to shift over time. Replacing an extracted tooth with an implant, bridge, or partial denture involves additional procedures, time, and cost. Root canal treatment, followed by an appropriate restoration such as a crown, allows the original tooth to remain functional for many years in the majority of cases. Your dentist is best placed to advise whether a tooth is restorable or whether extraction is truly the appropriate course.

Dental pulp (the soft tissue inside a tooth containing nerves and blood vessels) can become infected or die following deep decay, repeated dental procedures on the same tooth, a crack, or a traumatic injury. Once the nerve tissue is fully non-vital (dead), the tooth may stop hurting — but bacteria can still inhabit the root canals and spread into surrounding bone, forming a periapical abscess (a pocket of infection at the root tip). This is often detected on an X-ray rather than through symptoms. Waiting for pain to appear is not a reliable indicator of when treatment is needed. See our plain-language dental glossary for definitions of terms like periapical abscess and pulpitis.

The claim that root canals cause cancer, heart disease, or other systemic illnesses stems from the so-called "focal infection theory" popularised in the early 1900s, primarily by Weston A. Price. That research has since been widely rejected by the dental and medical communities due to fundamental flaws in methodology. Major dental and medical bodies, including the American Association of Endodontists, consistently affirm that root canal treatment is safe and does not contribute to disease elsewhere in the body. In fact, leaving a severe dental infection untreated carries its own serious risks — including the potential for infection to spread to surrounding tissues. Decisions about treatment should always be made with a qualified dental professional based on current evidence.

Treatment duration varies by the tooth involved — front teeth typically have one or two canals, while molars can have three or four — and by whether the infection requires additional steps before sealing the tooth. Advances in rotary instruments, digital imaging, and dental materials have significantly streamlined the process compared to older techniques. A straightforward case can often be completed in a single visit. Even when two visits are necessary, most patients find the time commitment manageable. The procedure itself involves removing the infected pulp tissue, cleaning and shaping the root canals, and sealing them with a filling material. A crown is usually placed afterwards to protect and restore the tooth. Compare this to the alternative: tooth extraction followed by a replacement option such as an implant, which typically involves several appointments over months.