The only study focusing on periodontitis that evaluated haplotypes of the PPARG gene (A-C-C = rs2067819-A, rs1801282-C, and rs3856806-C) demonstrated a slight association with chronic periodontitis (OR = 1.53; 95% CI, 1.01–2.32, p = 0.04) [37]. Here, PPARG is linked to periodontitis.