| Summary: | The (-)-<i>Epigallocatechin</i>-<i>gallate</i> (EGCG) metabolite is a natural polyphenol derived from green tea and is associated with antioxidant, biocompatible, and anti-inflammatory effects. Objective: To evaluate the effects of EGCG to promote the odontoblast-like cells differentiated from human dental pulp stem cells (hDPSCs); the antimicrobial effects on <i>Escherichia coli</i>, <i>Streptococcus mutans</i>, and <i>Staphylococcus aureus</i>; and improve the adhesion on enamel and dentin by shear bond strength (SBS) and the adhesive remnant index (ARI). Material and methods: hDSPCs were isolated from pulp tissue and immunologically characterized. EEGC dose-response viability was calculated by MTT assay. Odontoblast-like cells were differentiated from hDPSCs and tested for mineral deposition activity by alizarin red, Von Kossa, and collagen/vimentin staining. Antimicrobial assays were performed in the microdilution test. Demineralization of enamel and dentin in teeth was performed, and the adhesion was conducted by incorporating EGCG in an adhesive system and testing with SBS-ARI. The data were analyzed with normalized Shapiro–Wilks test and ANOVA post hoc Tukey test. Results: The hDPSCs were positive to CD105, CD90, and vimentin and negative to CD34. EGCG (3.12 µg/mL) accelerated the differentiation of odontoblast-like cells. <i>Streptococcus mutans</i> exhibited the highest susceptibility < <i>Staphylococcus aureus</i> < <i>Escherichia coli</i>. EGCG increased (<i>p</i> < 0.05) the dentin adhesion, and cohesive failure was the most frequent. Conclusion: (-)-<i>Epigallocatechin</i>-<i>gallate</i> is nontoxic, promotes differentiation into odontoblast-like cells, possesses an antibacterial effect, and increases dentin adhesion.
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