MMP8 and periodontitis: Salivary MMP‐8 levels were also significantly different between healthy and periodontitis subjects as assayed by the biosensor (p < .001, Figure 1A), aMMP‐8 IFMA (p < .001, Figure 1B), and total MMP‐8 ELISA (p < .001, Figure 1C) and significantly different between gingivitis and periodontitis participants as measured by the biosensor (p < .001, Figure 1A), aMMP‐8 IFMA (p < .01, Figure 1B) and total MMP‐8 ELISA (p < .001, Figure 1C).