In Table 4, we summarize the characteristics of the salivary markers OPG, IL-1β, RANK-L and IL-17A in the patients classified based on the periodontitis progression rate into three categories, slow, moderate and rapid progression, indicating grade A, B and C, respectively, as defined by Tonetti et al., 2018 [8]. Here, TNFRSF11B is linked to periodontitis.