As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
The paper presents a review of results concerning the role of host cysteine proteases, especially cathepsin B and cystatins in periodontal pathogenesis. Special attention was paid to the potential use of those biochemical parameters as biomarkers of periodontal disease activity.