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This research is a descriptive study. The purpose of conducting this survey was to estimate the prevalence of dental carvies by calculating the mean of Decay- Missing • Filling Teeth (D. M. F.) and (d.mf.) indices for about and children in the province ofzanjan in 1990.Independent variable was age and dependent were Decayed - Missed and Filled teeth.The total population of 300 were studied and chosen as sample size and consist/69 females and 131 males of those 200 people were chosen from urban (Zanjan) and 100 from rural (Dizeg-Abad).The results of this study shows thefolowing indications.1. At age 5-6 years old 100% were carries free in permanent teeth. While at age / 2 only 5% in urban and 6.5% in rural were carvies free.2. The mean of D.M.F at age 12, 15 and 35-44 were seen between urban and rural but it was significant by applied T.Test.Besides D.M.F. the investigator also tried togather some deta in some aspects of "knowledge", "Attitude" and "Practice", (KA.P) in regards of population oral health, by using multiple questionnaire.The analysis of deta indicates the following findings*3. Around 40% of the arban population who wereinterviewed indicated that they brush theirteeth daily (once a day), 50% after each and 7% occasionally.And around 28% of rural popution answered that they had the habit for daily beashing, and 20% after each meal and 46% occasion' ally.The X2 test were performed between these two categorize and the result was highly significant.