MMP9 and periodontitis: [33], machine‐learning modeling allowed to identify a group of five proteins (MMP‐9, Ras‐related protein‐1, Actin‐related protein 2/3 complex subunit 5, Clusterin, Deleted in Malignant Brain Tumors 1) with high predictive value for periodontitis [maximum area under the curve] (AUC) > 0.97.