The red complex is a group of bacteria that are categorized together based on their association with severe forms of periodontal disease. The red complex-among a number of other complexes-were classified by Sigmund Socransky in 1998. The three members of the red complex are: Porphyromonas gingivalis, Tannerella forsythia Treponema denticola . There presence in the oral cavity causes changes in hydrogen ion concentration
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