The problem is inside the tooth
Under a tooth's enamel and dentin is a soft center called the pulp. It contains nerves, blood vessels, and connective tissue. Deep decay, a crack, trauma, or repeated dental work can inflame or infect that tissue. Once the pulp cannot recover, removing it may be the best way to relieve symptoms and keep the natural tooth.
Possible signs include lingering sensitivity to temperature, pain when biting, swelling, or a pimple-like spot on the gum. Some damaged teeth cause few symptoms and are discovered during an examination. A diagnosis may include temperature testing, gentle pressure or tapping, and dental images.
What happens during treatment
Local anesthetic numbs the tooth and nearby tissue. A protective sheet called a dental dam isolates the tooth and keeps the working area clean. The dentist or endodontist creates a small opening, removes the inflamed or infected pulp, and uses fine instruments to clean and shape the root canals.
The canals are disinfected, filled with a biocompatible material, and sealed. Treatment may be completed in one appointment or divided between visits, depending on the tooth and the condition of the tissues. A temporary filling may protect the opening until the final restoration is ready.
Modern anesthesia means the procedure itself is often comparable to other restorative dental work. The pain that brings someone to treatment may be far more noticeable than the sensations during the appointment. Individual experiences still vary, and patients should tell the clinician if they feel discomfort.
The final restoration is part of the treatment
A root canal treats the internal infection, but it does not rebuild missing tooth structure. Many back teeth need a crown or another strong restoration afterward because they have already been weakened by decay, cracks, or large fillings. Delaying that step can leave the tooth vulnerable to fracture or leakage.
Until the tooth is permanently restored, avoid using it for hard chewing unless the treating clinician says otherwise. Keep the area clean and attend the restorative appointment on schedule. A root canal and a crown are often discussed separately, but together they address different parts of the same problem.
Soreness should improve, not escalate
Mild tenderness for a few days can occur, especially if the tooth was painful before treatment. Follow the medication and care instructions provided for the specific case. Numbness should wear off before chewing to reduce the chance of biting the cheek or tongue.
Call the treating office if pain or swelling becomes severe, symptoms return after settling, the bite feels markedly uneven, or a temporary filling comes out. Root canal treatment has a strong record of retaining natural teeth, but follow-up and a sound final restoration are central to that result.
When an endodontist may be involved
General dentists perform many root canals. An endodontist has advanced training focused on pulp disease and treatment inside the tooth. Referral may be useful when canals are unusually narrow or curved, a previous root canal needs retreatment, symptoms are difficult to diagnose, or surgery near the root is being considered.
Referral does not necessarily mean the problem is more painful or that the tooth cannot be saved. It may simply provide specialized imaging, instruments, and experience for a complex anatomy. The general dentist and endodontist often share the work, with one treating the canals and the other completing the final restoration.
Sources and further reading
Editorial note: This article is for general educational purposes and is not a substitute for an examination, diagnosis, or treatment plan from a qualified health professional.
