OBJECTIVES Patients with RA suffer from a higher risk of periodontal attachment loss and increased oral inflammation.There were few studies to access the utilization of dental care among RA in the Taiwan.The purpose is identify realize analyze and discuss the dental use of diabetic patients, and the association between the risk of rheumatoid arthritis (RA) and a history of periodontitis. METHODS retrospective cohort studybased on the nationwide, population-based ,NHIB used administrative data ,case group consisted of 5,506 (age ≥18 years) patients with rheumatoid arthritis (RA group) as the study group and 22,024 patients without RA attending the Outpatient wing of Department of General Medicine formed the control group (NRA group). Matched for Age, gender and RUB, Both groups were matched on 1:4. RESULTS More advanced forms of periodontitis were found in RA patients compared with controls. The results showed that RA patients( 66.9% of RA) had 5-years utilization rate of dental care than non-RA patients ( 13.9% of non-RA).However, people have RA or not, the characteristics of dental use were similar. Only has the gender aspects to differ from, when the male suffered from RA, the utilization of dental care were not different with the female. CONCLUSIONS we propose that the consulting rheumatologists inform the patients that they have a higher risk of periodontal .this study demonstrates an association between periodontitis and incident RA. And the study is limited to lack of BMI, smoking,alcohol status.