Objective <p>This study aims to evaluate the influence of opalescence in the color matching ability of dental composites.</p> Methods <p>Single-disc samples were prepared using 10 commercially available composites (6 conventional, 3 simplified-shade, and 1 single-shade). Dual-color samples were created using Omnichroma, Ceram.X Sphere TEC (A3 shade), and DenFil (B2/C2 shade), with various cavity diameters in the center, which were then filled with the aforementioned 10 composites. Additionally, single-color samples were prepared using the 4 base composites mentioned above. The ΔE_Single-Dual were calculated as differences between single and dual samples. The color coordinates (CIE <i>L</i>^<i>*</i><i>a</i>^<i>*</i><i>b</i>^<i>*</i>) of the samples were measured using a spectrophotometer. The results of translucency parameters (TP) and opalescence parameters (OP) of the 10 composites were compared with ΔE measurement samples.</p> Results <p>TP and OP generally had a linear correlation, and ΔE_Single-Dual mostly increased with cavity diameter. Regarding the correlation between ΔE_Single-Dual and TP, little correlation was observed in the conventional composite bases, but higher correlations were observed in the simplified- or single-shade composite bases. Regarding the correlation between ΔE_Single-Dual and OP, inverse correlations were observed in the conventional composite bases and simplified composite bases, but the single-shade composite base showed the linear correlations with OP.</p> Conclusions <p>These findings highlight a potentially greater role for opalescence in the color matching ability of dental composites than previously acknowledged.</p>