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Light-curing composite restorative materials are widely used by dentists of various specialties in the esthetic restoration because of their optimal mechanical properties and predictable desired aesthetics. However, their use requires special attention to the safety of the components used. In recent decades, polymer composites have been developed with the objective of reducing cytotoxicity and shrinkage during polymerization and improving aesthetics. The biocompatibility of all polymeric materials is an issue that requires special focus on the chemical composition of biopolymers, which consist of an organic resin matrix and ceramic reinforcing filler particles bonded with a silane. The special priority in biocompatibility studies has focused mainly on the organic resin polymer matrix. And among the components of composite resins, the polymer matrix is the only unstable one, mainly because of the unbound monomers that can be released and remain as free monomers during the polymerization step. The aim of this study was to evaluate the effectiveness of preheating composite restorative materials on composite conversion and their cytotoxic properties. The use of composite restorative materials preheating in dental practice allows dentists to reduce the cytotoxicity of composite materials and improve their degree of conversion, since there is a direct relationship between increasing the conversion of the material and reducing its cytotoxicity. Preheating has a positive effect on composite, resulting in reducing their cytotoxic properties and optimizing the biocompatibility of the polymer matrix with hard tissues. The conversion of the material is improved, since there is a direct correlation between the increase in the conversion of the material and the reduction of its cytotoxicity. [ABSTRACT FROM AUTHOR]