FN1 and periodontitis: Fn is frequently detected in inflammatory oral infections, such as gingivitis, pulpitis, peri-implant disease, Vincent’s angina, peritonsillar abscesses, periapical abscesses, and leukoplakia, and is a major contributor to halitosis as well.123–128Fn has also been identified as a key pathobiont in the development of periodontitis,129–131 and is especially abundant within odontogenic abscesses.