Root canal treatment, only when it's truly needed.

When the pulp inside a tooth becomes irreversibly inflamed or infected, most often from deep caries that has reached the nerve, sometimes from trauma or a deep crack, the body cannot heal it on its own. The two options are removing the entire tooth or removing only the pulp tissue and saving the tooth. Modern endodontic treatment is the second option: a careful, microscope-assisted cleaning and disinfection of the internal canal system, followed by a sealed obturation and a definitive bonded restoration.

The outcome data on properly performed non-surgical root canal treatment is genuinely good. A systematic review of tooth survival after root canal treatment reported pooled survival rates above 85% at 8-10 years across many studies ^[1]. Earlier systematic reviews of treatment outcome, looking specifically at periapical healing rather than tooth retention, show success rates in the same range when modern technique is used ^[2]. These are not numbers from idealised laboratory conditions. They are real-world outcomes from clinical practice.

For decades, deep caries close to the pulp meant a root canal was on the table. The evidence has moved on. The 2016 international consensus on managing carious lesions recommends leaving a thin layer of softer affected dentine over the pulp in deep cavities and sealing it under a well-bonded restoration, rather than excavating until the pulp is exposed ^[6]. In practice this single change has prevented an enormous number of root canals worldwide, simply by stopping clinicians from creating the very pulp exposure they were trying to avoid.

When the pulp is already symptomatic, vital pulp therapy is the next level of conservative management. A 2019 systematic review of full pulpotomy in mature carious teeth with symptoms of irreversible pulpitis reported clinical success rates well above 80% in selected cases ^[5]. That is a substantial body of evidence supporting an option that, twenty years ago, would have been dismissed outright. It does not replace root canal treatment for every case, but it expands the conservative menu meaningfully, and for the right tooth in the right patient it preserves a vital pulp that would otherwise have been removed.

There are situations where a root canal is unambiguously the right call: a frankly necrotic pulp, a periapical lesion on radiograph, irreversible symptoms unresponsive to conservative care. When that is the case, modern endodontics emphasises preserving as much pericervical dentine as possible. The Clark and Khademi paper on modern molar access advanced the principle that the access cavity should be as small as possible while still allowing the canals to be located and instrumented ^[4]. Larger straight-line access used to be standard teaching. The trade-off, convenience for the operator at the cost of long-term tooth strength, is no longer one I am willing to make.

The other principle that has shaped modern endodontics is older than I am: the long-term outcome of a root-treated tooth depends on the quality of the final restoration at least as much as it depends on the obturation. Ray and Trope's classic 1995 study showed exactly this, teeth with both a good root filling and a good coronal restoration fared dramatically better than teeth with one or the other alone ^[3]. The implication is unambiguous: the day the canal is sealed, the access cavity must be sealed permanently with a properly bonded restoration. A temporary filling left in place for weeks is the most common cause of preventable endodontic failure I see in second-opinion cases.