Abstract
Multiple sclerosis (MS) is a demyelinating, progressive, and neurodegenerative disease. The cause of this condition remains unknown. Diagnosing and monitoring the course of this disease requires the use of time-consuming, costly, and invasive methods such as magnetic resonance imaging and cerebrospinal fluid analysis. To date, no specific diagnostic tests for MS are available. The purpose of this publication is to answer the question of whether saliva, as a mirror of oral and general health and easily obtainable test material, can be a significant source of information on etiological factors, biomarkers, and indicators of disease progression and whether analysis of substances in saliva is sensitive enough to replace plasma, urine, or cerebrospinal fluid. For this purpose, a systematic search of databases was conducted: PubMed, Google Scholar, and Embase.