Remineralizing composite materials are increasingly represented in scientific studies and are gradually finding their way into clinical practice in order to reduce the occurrence of secondary caries as the most important factor in the failure of composite restorations due to polymerization shrinkage and the resulting formation of marginal gaps. These materials contain active fillers that stimulate remineralization of the tooth structure through the gradual release of calcium, phosphate, fluoride and other ions. In addition to remineralization, which occurs through the incorporation of ions into the crystal lattice of the hydroxyapatite of the hard dental tissues, the precipitation of calcium phosphates on the surface of the material is also possible. One of the better-known fillers in composite materials that can serve as a source of remineralizing ions is bioactive glass, the structure of which can be adapted depending on the intended use, which is why it is now included as a filler in experimental, but also in some commercial composite materials. The term "bioactivity" in bioactive glass is used to indicate the release of remineralizing ions in the aqueous medium and the deposition of hydroxyapatite on the surface, which can theoretically seal the marginal gap. Additional effects of bioactive glass include the alkalization of the surrounding aqueous medium and the antibacterial effect. The best-known commercial composite material with a remineralizing effect is Cention, which is a potential alternative to conventional composite materials due to its satisfactory esthetics and mechanical properties, the possibility of applying a thick layer, its remineralizing effect and its financial acceptability, represents a potential alternative to conventional composite materials. Other commercially available remineralizing composite materials include Activa Bioactive, Activa Presto and Surefil One. A major shortcoming of commercial remineralizing materials is their rapid introduction to the dental market, while there is insufficient clinical evidence of their actual remineralizing effect on dental hard tissue.