Objective: The study evaluated the discoloration effects of various staining agents, specifically coffee, qat, a mixture of qat and red soft drink, and distilled water, on different resin-based composite materials. Additionally, the effectiveness of an in-office bleaching agent in restoring color stability and removing stains from these composites was assessed. Materials and Methods: An in-vitro experimental observational study was conducted, where 60 discshaped resin composite specimens (Merfill Bulk Fill, Charm Microhybrid, Tokuyama Supra-Nano) were immersed in the staining solutions for 7 days, followed by an in-office bleaching protocol and a home bleaching treatment. Color measurements were taken before immersion, after staining, and postbleaching using a VITA Easy Shade V Spectrophotometer, with color differences (ΔE values) calculated. Results: All resin composite specimens exhibited significant color changes after immersion in staining solutions, with coffee causing the most discoloration, especially in Merfill Bulk Fill and Tokuyama Supra-Nano composites. In-office bleaching effectively restored color stability, with the most significant improvements seen after two applica
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