A dental mock-up is a physical, temporary visualization of a patient's potential new smile, created on their actual teeth using a temporary tooth-colored material. It allows patients to preview cosmetic dental treatments like veneers or crowns before permanent changes are made, serving as a crucial tool for patient communication and treatment planning by validating aesthetics and function. The mock-up is often a temporary overlay, worn for several days, allowing for adjustments and feedback before the final restoration is created.