Introduction: The purpose of this cross- sectional study was to evaluate the prevalence of dental caries in 15 year old high school students of Yazd. Methods: A total of 295 boy students with mean age of 15 years± 6 month in 2002 and 180 boy students in 2009 were selected randomly and after necessary examination, the obtained data was recorded and evaluated. Results: The over all mean DMFT was 4.8± 3.13 and 11.5% of the subjects(34 cases) were caries free. 4.4% of the population had DMFT> 10 and 6.92% of DMFT was due to extracted teeth. Meanwhile, 77.5% of the DMFT was due to decayed teeth. Also, the percentage of teeth with fillings was 15.53%. Of the total, 93.08% had all the teeth present in their mouth that is a little higher than the 2000 WHO criteria which is 85%. Conclusion: Preventive and therapeutic dentistry services in Yazd city are far from the standard levels and therefore the results of this study could be utilized for systematic planning of preventive and therapeutic affairs.

Keywords: DMF Index, Oral Hygiene Index, prevalence

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