Objective: To investigate the effect of using different food simulant materials on the shear bond strength (SBS) of orthodontic bracket after Icon application. DESIGHN: Laboratory study. SETTING: Pediatric dentistry, Orthodontics & Prevention dentistry department, Dentistry College, Kufa University & department of materials, Technology university. Methods: Metal brackets were bonded to 48 extracted premolars and were randomly arrange for three categories with 16 teeth for each, revealing the

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... rage solutions, which were distilled water, 50% aqueous ethanol (alcoholic food), and corn oil (fatty food). Then each category was split for two subgroups, with 8 teeth describing Icon application, all specimens are immersed in their corresponding food simulants for 30 days. After the completed proposed time, the specimens were debonded by using an Instron apparatus to test the SBS. Results: Results showed significantly diminished the bond strength of orthodontic adhesive after holding the specimens for 30 days in the food simulants specially ethanol (highest for 50% ethanol, less for corn oil & least for D.W). Icon categories showed higher SBS rather than non-Icon categories. Conclusion: Application of Icon on enamel will increase the bond strength & the food simulating agents especially food and rinses containing ethanol could influence the orthodontic bond strength which causes bond failure so that the clinicians should inform their patients concerning their possible adverse effects and complications.