The International Classification of Headache Disorders third edition (ICHD-3), a publication by the International Headache Society. https://ichd-3.org/[5] The Classification of Chronic Pain Second Edition (Revised), a publication by the International Association for the Study of Pain.[6] Orofacial Pain: Guidelines for Assessment, Diagnosis, and Management, Fifth Edition by American Academy of Orofacial Pain (AAOP): www.aaop.org.[7] The Research Diagnostic Criteria for Temporomandibular Disorders (see TMD).[8]