Our findings have demonstrated higher levels of MMP7 in salivaand GCF samples from patients with periodontitis relative to healthy controls are in agreement with our RNA sequencing results, which revealed overexpression of MMP7 in gingival tissue biopsies of patients with periodontitis [10].Levels of MMP7 have, to our knowledge, not previously been reported in saliva of periodontitis patients [10]. Here, MMP7 is linked to periodontitis.