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The emergence of high‐throughput technologies for the comprehensive measurement of biomolecules, also referred to as “omics” technologies, has helped us gather “big data” and characterize microbial communities. In this article, we focus on metaproteomic and metabolomic approaches that support hypothesis‐driven investigations on various oral biologic samples. Proteomics reveals the working units of the oral milieu and metabolomics unveils the reactions taking place; and so these complementary techniques can unravel the functionality and underlying regulatory processes within various oral microbial communities. Current knowledge of the proteomic interplay and metabolic interactions of microorganisms within oral biofilm and salivary microbiome communities is presented and discussed, from both clinical and basic research perspectives. Communities indicative of, or from, health, caries, periodontal …