The results showed a statistically significant difference, with higher levels of the biomarkers in all periodontitis groups compared with controls except for stage III, where the levels of IL-17 dropped significantly (Table 4,Fig. 5), while for IL-10, there showed to be a difference between stage III and the controls; however, it is of no statistical significance (Table 5,Fig. 6). Here, IL17A is linked to periodontitis.