TNF and periodontitis: Mean salivary levels of IL-6 and TNF-α were significantly higher (p = 0.001) in subjects with periodontitis than in healthy subjects: 25.1 (±11.2) vs. 16.3 (±5.0) pg/mL and 29.7 (±17.2) vs. 16.2 (±7.6) pg/mL, approximately 1.5 times and 1.8 times more, respectively.