Objective: Resin composite restorations typically last 6–10 years but often fail due to mechanical fatigue, hydrolytic breakdown, and degradation at the interface. These failures result in frequent replacements, leading to significant clinical and environmental impacts. Extending restoration durability is essential for both patient care and sustainability. This review examines recent advances in self-healing dental biomaterials, emphasising the underlying chemical and physical mechanisms, their integration into resin composites, cements, and adhesives, and their relevance to sustainable restorative practice. Materials and methods: A narrative review methodology was employed to synthesise the current evidence. Studies on self-healing mechanisms, including extrinsic (capsule- or reservoir-based) and intrinsic (dynamic covalent, supramolecular, or shape-memory polymer) systems, were critically evaluated with emphasis on evidence relevant to dental resin composites, cements, and adhesives. Parallel insights from polymer and material sciences were included where dental-specific research was limited. Supplementary searches were conducted on Google Scholar for additional peer-reviewed art
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