what pathogens are involved in periodontitis
Periodontitis is caused by microorganisms that adhere to and grow on the tooth's surfaces, along with an over-aggressive immune response against these microorganisms.he 1999 classification system for periodontal diseases and conditions listed seven major categories of periodontal diseases, of which 2-6 are termed destructive periodontal disease because the damage is essentially irreversible. The seven categories are as follows: 1  Gingivitis.