MPO and metabolic syndrome: Salivary MPO also exhibited significant between‐group differences (p < 0.01), with elevated levels in MetS‐PD (13.53 ± 1.80 ng/mL) versus SH‐PD (12.33 ± 1.72 ng/mL) and SH‐PH (11.55 ± 2.56 ng/mL).