Subjects with clinical registrations of DMFT, periodontal status and corresponding treatment codes
Self-reported systemic diseases including Diabetes Mellitus Type 2, Cardiovascular Diseases and Rheumatoid Arthritis
Subjects with Clinical Attachment Loss\>=3mm, Probing Depth \>= 3mm and bleeding on probing (as defined by World Workshop 2017- criteria for periodontitis) in clinical examination will be included in the study population.
