Objective:To investigate the current status of periodontal diseases in the population at the age of 12

35~44 and 65~74 years in Chongqing

to provide information for the establishment of oral health care policies in Chongqing. Methods:A stratified equal-sized randomly sampling design was applied to obtain 751 objects aged at 12 years old

723 objects aged at 35~44 years old and 722 objects aged at 65~74 years old of three cities and three rural areas in Chongqing. The status of gingival bleeding

dental calculus

periodontal pocket and loss of attachment were assessed according to "The Guidline for the Third National Oral Health Survey" by using a CPI prode.The detection rates were calculated and were compared in aspect of area and gender. Results:In the group aged 12

the detection rates of gingival bleeding and dental calculus were 79.49% and 86.68% respectively and the detection rates of dental calculus in rural areas were higher than that of urban residents(P<0.05). In the group aged 35~44

the detection rates of gingival bleeding

dental calculus

periodontal pocket and loss of attachment were 87.83%

99.17%

49.10% and 48.13% respectively. The detection rate of gingival bleeding in rural area was higher than that of urban residents(P<0.05)

and the detection rate of periodontal pocket of male group was higher than that of female group(P<0.05). In the group aged 65~74

the detection rates of gingival bleeding

dental calculus

periodontal pocket and loss of attachment were 73.13%

88.64%

50.97% and 86.84% respectively. The detection rate of dental calculus of urban residents was higher than that of rural ones(P<0.05)

and the detection rate of periodontal pocket of male group than that of female group(P<0.05). Conclusion:Detection rates of gingival bleeding and dental calculus of 3 age groups in Chongqing are comparatively high. Periodontitis is still the common disease affecting oral health of the middle-aged and the elder in Chongqing.