This clinical research which has dealt with influence of the systemic condition on periodontal disease indicated that some of these systemic problem could be as a predisposing factor in inducing periodontal diseases. On the most important of these systemic problems in “diabet mellitus” which could play a role as predisposing and accelerating factor for periodontal problems.

Since about 2 to 3 millions of Iranian population have diabet mellitus and not any effort has been done to evaluate their periodontal condition, so far, we decided to make an epidemiologic investigation on periodontal problem of diabetic individuals by using CPITN index. According to the statistical results of investigation about 100% of the examined diabetic individuals need oral-hygine instruction and 91.7% need scaling besides oral-hygine instruction and 13.3% need more complex periodontal treatment including oral hygine instruction, scaling and surgical procedure. The diabetic population of our country, as high risk group, need more attention in order to prevent of periodontal disease.