Impact of kombucha, coffee, and turmeric beverages on the color stability of a single-shade versus a multi-shade resin-based composite: Study

Results showed that turmeric caused the highest degree of discoloration (p < 0.001), followed by coffee and then kombucha. Additionally, the universal RBC demonstrated significantly better resistance to staining compared to the single-shade APS-based composite (p = 0.004). Researchers concluded that time, staining medium, and material type all significantly influenced color changes (p = 0.005 for three-way interaction).

These findings highlight a potential esthetic limitation of single-shade composites, particularly when patients consume beverages or foods containing strong chromogens like turmeric. While turmeric’s staining potential was already well-documented on natural teeth, this study adds valuable evidence of its impact on modern composite resins, especially those marketed for universal shade-matching convenience. Clinicians may need to consider this when selecting materials for patients with high exposure to staining agents.

The authors recommend further long-term studies to confirm these results and to evaluate whether surface finishing, polishing, and sealing techniques can mitigate discoloration over time. This study underscores the importance of patient education regarding dietary habits and the impact of staining beverages on restorative esthetics, especially for those seeking long-lasting cosmetic results.