“…Recently, periodontal disease is a changed concept, no longer linked to a certain bacterium, but more to polymicrobial groups, these causing dysbiosis and modifying normal immune responses. It has been demonstrated that Porphyromonas gingivalis (a pathogen found in humans in the oral cavity), in small numbers (<1%) determines and modulates the virulence of the entire community [ 11 , 12 , 13 , 14 , 28 ]. Moreover, dysbiosis causes periodontitis and thus the subgingival microbiome is important in the pathogenesis of the disease and has been associated with systemic diseases, such as oral, esophageal, gastric, lung, pancreatic, prostate and breast cancer.…”