Saliva has emerged as a promising alternative to traditional serum-based diagnostic tests. This unassuming bodily fluid is rich in locally produced and serum-derived markers, proving its efficacy in diagnosing systemic disorders. Its simplicity, non-invasiveness, and safety for patients and healthcare providers make it a convenient point-of-care diagnostic tool, suitable for monitoring multiple biomarkers in diverse populations. Saliva's cost-effectiveness positions it as a compelling option for large-scale screening. Advancements in diagnostic techniques, such as proteomics and genomics, are...