IL37 and chronic periodontitis: Since IL-23 is involved in the pathogenesis of type 2 DM and chronic periodontitis (CP), and there are controversies in some studies (12, 13) and lack of any data about the role of IL-35, we aimed to investigate the serum levels of IL-23 and IL-35 in people with type 2 DM and CP and compare them with the control group.