IL6 and periodontitis: Several biomarkers for periodontitis have been diagnosed from these biofluids, such as metalloproteinase‐8 (MMP‐8), interleukin 1‐beta and interleukin 6 (IL‐1 β, IL‐6), macrophage inflammatory protein‐1 alpha (MIP‐1 α) and hemoglobin (HB) (Zhang et al. 2021; Blanco‐Pintos et al. 2023; Cafiero et al. 2021).