An endodontist is a dental specialist who focuses on diagnosing and treating issues related to the dental pulp and tissues surrounding the roots of a tooth. They are experts in performing root canal treatments, which involve removing infected or damaged pulp to save the tooth and alleviate pain. Endodontists complete additional training beyond dental school, typically a two- to three-year residency program. This specialized knowledge allows them to handle complex cases and use advanced techniques and technologies, ensuring better outcomes for patients with tooth pain or infection.