“…A second common origin for blood microbes is the non‐sterile oral cavity (Gargano & Hughes, ), whence they can enter through abrasive toothbrushing (Bhanji et al ., ; Tomás et al ., ) or periodontal disease. Since blood can appear in the oral cavity, there is nothing to stop the reverse process of microbial infection of the blood (Dhotre, Davane & Nagoba, ; Kilian et al ., ; Koren et al ., ) and periodontal origins represent another source of potential microbial translocation (Moon & Lee, ). There is considerable evidence for a significant association between periodontitis and RA (Bingham III & Moni, ; Cheng et al ., ; de Smit et al ., ; Detert et al ., ; Konig et al ., ; Koziel, Mydel & Potempa, ; Lee et al ., ; Martinez‐Martinez et al ., ; Mikuls et al ., ; Monsarrat et al ., ; Ogrendik, ; Potempa, Mydel & Koziel, ).…”