Periodontitis (Pyorrhea) By James T Ubertalli, DMD, Hingham, MA Reviewed / Revised May 2022 | Modified Sep 2022 View Patient Education Pathophysiology Risk Factors Classification Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Periodontitis (Loss of Supporting... Periodontitis Chronic Periodontitis Periodontitis is a chronic inflammatory oral disease that progressively destroys the tooth-supporting apparatus.