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Psoriasis is a widely prevalent chronic immunoinflammatory dermatological disease resulting from a complex and dynamic interplay of genetic, environmental, and immunological aetiologies. It manifests as characteristic erythematous psoriatic plaques visible to the naked eye, but prognostic biomarkers for disease monitoring and therapeutic effectiveness are still absent. Saliva is a biological fluid that, besides being critical to maintaining oral homeostasis, harbors various salivary microbiota and inflammatory markers. It can be easily collected, stored, and analyzed. Oral fluids offer an excellent advantage for biomarker study as they are non-invasive and fast techniques. Studies showed that the saliva of healthy individuals and those with psoriasis had differences in the levels of inflammatory cytokines, immunoglobulin A, and anti-oxidant biomarkers. In GCF, individuals with psoriasis showed higher levels of S100A8, IL-18, and sE-selectin than healthy individuals, independent of periodontal status. Oxidative stress(OS) is one of the pathogenetic factors of psoriasis. Thus levels of ROS and anti-oxidants can also become important factors in diagnosis. [ABSTRACT FROM AUTHOR]