Abstract: 【Abstract】Objective To understand the oral condition, attitude, knowledge and behavior of 12-year-old teenagers in suzhou, and provide basis for dental prevention. Methods Five districts and one city of suzhou city were selected by multi-stage, stratified and random sampling method. The oral examination with CPI probe and questionnaire were made according to the fourth oral epidemiology method. Results 32.7% of 1666 children aged 12 years with caries experience and their DMFT was 0.62.About 19.3% of deciduous teeth was filled. The prevalence rates of gingival bleeding and dental calculus were 87.1% and 82.3% . 92.4% of the surveyed population had a positive attitude towards oral health.The survey of dietary habits showed that 71.9% of the population ate sugary food once or more per day.63.6% of the 97.6% population brushed their teeth twice or more every day.1.6 per cent and 1.3 per cent of the population flossed weekly and daily. 66.1% of them had dental treatment experience, among which 45.4% had the last dental visit time <12 months. Conclusion Oral health education and publicity should be strengthened to promote oral health in suzhou.

Key words: suzhou, oral , 12 years old, Teenagers