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Abstract Objectives This article examines the efficacy of two bioactive dental composites in preventing demineralization while preserving their mechanical and physical properties. Materials and methods The study compares Beautifil Kids and Predicta® Bioactive Bulk-Fill (Predicta) composites with conventional dental composite. Flexural strength and elastic modulus were evaluated using a universal testing machine. A pH-cycling model assessed the composites’ ability to prevent dentin demineralization. Color stability and surface roughness were measured using a spectrophotometer and non-contact profilometer, respectively, before and after pH-cycling, brushing simulation, and thermocycling aging. Results Beautifil Kids exhibited the highest flexural strength and elastic modulus among the materials (p 0.05). Predicta exhibited greater color change after brushing and increased surface roughness after thermocycling aging (p