Which dental specialty involves the diagnosis and treatment of diseases related to the dental pulp?

The specialty that focuses on the diagnosis and treatment of diseases related to the dental pulp is endodontics. This field primarily deals with conditions involving the inside of the tooth, specifically the pulp, which contains nerves and blood vessels. Endodontists are skilled in performing root canal treatments, which are necessary when the pulp becomes infected or inflamed.

In contrast, oral pathology concentrates on the nature and management of diseases affecting the oral and maxillofacial regions but does not specialize specifically in the treatment of pulp conditions. Periodontics centers on the structures supporting the teeth, such as gums and bone, while restorative dentistry focuses on restoring damaged or missing teeth. Therefore, endodontics is the correct answer as it directly addresses pulp-related diseases and their treatment.