Porphyromonas gingivalis is a common pathogenic bacterium that is responsible for causing periodontal diseases, such as periodontitis and gingivitis. There are several synonyms for the term Porphyromonas gingivalis, which can be used interchangeably. Some of these synonyms include P. gingivalis, Bacteroides gingivalis, and Prevotella gingivalis. Another synonymous term for P. gingivalis is a gram-negative anaerobic bacterium commonly found in dental plaque. It is important to understand the various synonyms associated with Porphyromonas gingivalis to ensure proper identification and diagnosis of periodontal diseases. Early detection and treatment of P. gingivalis are essential to prevent tooth decay, gum recession and other periodontal problems.