Your saliva has a story to tell about your health. The oral microbiome can alter the balance between health and disease, locally and systemically. Within the oral cavity, bacteria, archaea, fungi, protozoa, and viruses may all be found, each having a particular role, but strongly interacting with each other and with the host, in sickness or in health. Early diagnosis of disease, quantification of disease, and prognosis of the treatment are vital steps in controlling and preventing the diseas...