## 4 Discussion  
Patients are making increasingly exacting aesthetic requirements as a result of greater patient awareness of dental appearance [3]. Light-cured indirect composite systems with color modifiers permits the characterization of acrylic resin teeth creating natural-lookingremovable dental prostheses [10]. Indirect composites used for modification of denture teeth include SR Nexco, Sinfony (3 M ESPE), Ceramage (Shofu), Gradia gum shades (GC), Signum (Heraeus Kulzer), Solidex (Shofu), SR Adoro (Ivoclar Vivadent), and Twiny (Yamakin) [15]. Their erratic color stainability and stability are some of the issues connected to the failure of cosmetic restorations. Dental plaque buildup, pigmentation from staining agents, dehydration, water absorption, surface roughness, chemical degradation, and oxidation of unreacted carbon double bonds are a few causes for color changes in resins [16]. It is abundantly evident that it is neither practical nor even feasible to assess color changes and differences just through eye inspection [17]. It has been suggested and proven that quantitative evaluations of the color stability of dental direct composite resins using standardized tools, such as colorimeters and/or spectrophotometers [1; 4; 6; 12; 13; 14; 18; 19; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32] are more practical. The degree of water absorption in resin-based composite materials directly correlates to stain sensitivity, which is influenced by the resin matrix's hydrophilic/hydrophobic properties [26]. The commonly used monomers for composite resins include Bis GMA, TEGDMA, and UDMA [33]. Both Bis GMA and TEGDMA contain hydroxyl groups and are relatively hydrophilic. On the other hand, composites with UDMA matrix do not contain hydroxyl groups and are hydrophobic and, therefore, demonstrate less water sorption and decreased propensity for discoloration [4]. Most of the indirect composites used for characterizing acrylic teeth are composed of UDMA resin matrix [26; 34]. The chemical makeup of drinks may also have an impact on color stability, since they absorb water-soluble pigments, which causes composite discoloration. Over the years, several colorants (food and other coloring agents) that may modify the color of dental materials have been researched, including tea and coffee (with or without sugar and milk), drinks, grape juice, wine, cherry juice, soy sauce, nicotine, and the disinfectants in mouthwashes. [1; 4; 6; 12; 13; 14; 18; 19; 20; 21; 22; 23]. Turmeric has the strongest staining ability of all the composite resins evaluated in this investigation. This is as a result of turmeric's well-known strong colorant nature and inherent staining potential [13; 30; 31]. In the present study, immersion in distilled water results in noticeable color changes in the composite used with 2.48 AE = 2.28 NBS units. It is shown that water accumulation and photo-oxidation affect the internal color of provisional restorative materials and change their optical properties. Immersion in distilled water causes the composite material used with 2.48 AE = 2.28 NBS units in the study to noticeably change color. It is demonstrated that photo-oxidation and water buildup modify the optical characteristics and interior color of temporary restorative materials [14]. Low pH media such as cola (pH 2.7) have been proven to influence the surface integrity of materials such as resins by softening the matrix and triggering a loss in structural ions from the glass phase, including calcium, aluminum, silicone, and other elements [35]. Previous research demonstrates that adding sugar and milk powder to tea and coffee causes a greater shift in color, with the changes being determined to be significant [4]. [PERSON] (2022) investigated the effect of different solutions on color stability of nano particles or fiber-reinforced PMMA using the NBS system, which showed significant different color changes between all tested groups (ZrO\({}_{2}\) nanoparticles, E-glass fibres, and TiO\({}_{2}\) nanoparticles) and across different time points.