A research was done in oral medicine department of Tehran University dental faculty. 50 patients (23f/ 27m) diagnosed with generalized periodontitis were selected. Questionnaires were obtained including information about demography, familial marriage, hygiene level, frequency of dental visits, teeth brushing, gingival health condition, tooth mobility and bone loss. Furthermore, blood sugar was assessed and compared via following laboratory exams: GTT 2hr, FBS GTT 3hr, GTT 0.5 hr, GTT 1hr.