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A comprehensive literature search was conducted across PubMed, Web of Science, Cochrane Library, Scopus, and Embase databases up to December 2023. Inclusion criteria consisted of preclinical studies in animal models of EP that examined the effects of biological agents on preventing periodontal bone loss and reducing tissue inflammation. Studies were excluded if they (i) used non\u2010EP animal models; (ii) focused on antimicrobial agents; (iii) centered on prebiotics or probiotics; (iv) evaluated compounds not classified as biologicals; or (v) included randomized clinical trials, clinical studies, or reviews. Eligibility was determined based on the PI\/ECOs framework, and study quality was assessed using the SYRCLE risk\u2010of\u2010bias tool.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> After screening an initial pool of 5236 records from databases, registries, and hand searches, 39 studies met the inclusion criteria. A total of 23 biological agents were evaluated across these studies. The majority of studies employed the ligature\u2010induced model of EP to test the effectiveness of biologicals as preventive or therapeutic interventions. The dosage of biological agents and the duration of disease induction varied depending on the EP model. In all studies, the main outcome\u2014alveolar bone loss, a hallmark of EP\u2014was significantly inhibited by biological agents, which also reduced proinflammatory mediators when compared to untreated controls. A key strength of this review is the high number of studies included, most of which were classified as having low risk of bias. However, a notable limitation is the absence of a meta\u2010analysis, the short follow\u2010up periods in the included studies, and the heterogeneity among the compound dosages and route of administration.<\/jats:p><jats:p><jats:bold>Conclusion:<\/jats:bold> This systematic review demonstrates that biological agents are effective in reducing bone loss and mitigating inflammation during EP progression. 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