questions 1,2,3,5,6,7,9 in questionnaire of knowledge: Diabetes may increase risk of developing oral health problems Diabetes may increase risk of periodontal problems (gum bleeding, teeth mobility, etc) Diabetes may cause reduction in salivary flow Controlling diabetes is important to minimize oral health complications Saliva is important to maintain oral health resistance to disease such as caries and gum inflammation Regular dental visit is more important for diabetic patients than non-diabetics When visiting the dentist, it is important to inform him about my general health including diabetes