Salivary biomarkers used to diagnose/monitor diseases include cortisol for Cushing disease or stress disorders [10,11]; C-reactive protein (CRP), creatine kinase isoform MB, and myoglobin for cardiovascular disease [12]; pathogens, nucleic acids, and antibodies for infectious processes [13,14]; α-2-macroglobulin and glycosylated hemoglobin (HbA1c) for diabetes [15]; and various interleukins (ILs), for cancers, gut diseases, and muscle or joint disorders [16]. The gene discussed is CRP; the disease is arthropathy.