Polymethacrylate (PMMA) denture base material was used in dentistry for fabricating removable complete and partial dentures since 1936. Many investigators exposed the denture base and denture teeth, to colored foods, different beverages, mouthwashes, and different materials. Coffee is highly consumable drink in many parts of the world, especially in Saudi Arabia (KSA). Where it is consumed in modified version commonly known as "Gahwa" starts by adding coffee beans with cardamom powder in

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... water. The aim of the study was to evaluate the influence of normally made coffee in KSA, on PMMA denture base materials. Materials and Methods: Samples were prepared from three different types of Denture base. Samples were divided into three groups depending on the types of denture base material. The coffee was prepared by adding 56 grams of Arabic coffee (Arabic Nescafe, Classic Nestle, Swiss) added in 2800 millimetre of boiling water and allowed to cool to 25°C. The contents were filtered with filter paper. PPMA samples then immersed in containers containing 10 ml of prepared coffee for 3 weeks. Daily fresh coffee was prepared for immersion of PPMA samples for staining. Colour analysis was carried out after 3 weeks. The color differences of specimens were assessed at the beginning and after 21st day of immersion. The Colorimeter (Shade Eye NCC; Shofu Dental Corporation, Kyoto, Japan) was calibrated as per the manufacturer's guidelines before analyzing color change of dried PMMA samples. Results: It was observed that there was a significant difference compared with PMMA (P < 0.001) and Polyamid after analyzing of variance (ANOVA). Huge colour change observed with Polyamid resins when compared with PMMA resins.