Background: The evolution of digital technology has revolutionized modern dentistry, particularly in the field of aesthetic and restorative treatment planning. Digital Smile Designing (DSD) has emerged as an advanced diagnostic and communication tool that integrates digital photography, 3D imaging, and computer-aided design/manufacturing (CAD/CAM) to create predictable and personalized treatment outcomes. Aim: This review aims to analyze the principles, applications, advantages, limitations, and future perspectives of Digital Smile Designing in contemporary aesthetic dentistry. Methodology: A structured literature review was conducted using databases such as PubMed, Scopus, ScienceDirect, and Google Scholar. Studies published between 2010 and 2025 were screened using keywords including “Digital Smile Design,” “aesthetic dentistry,” “CAD/CAM,” and “digital workflow.” Relevant peer-reviewed articles were selected based on inclusion and exclusion criteria, and the extracted data were thematically analyzed. Results: A total of 52 relevant studies were reviewed. The findings indicate that DSD significantly enhances diagnostic accuracy, treatment predictability, and patient satisfaction by allowing visual simulation of aesthetic outcomes prior to intervention. The technology also promotes interdisciplinary collaboration among dental professionals and facilitates communication through digital visualization. However, challenges such as high software cost, a steep learning curve, and dependence on digital tools remain barriers to widespread adoption. Conclusion: Digital Smile Designing represents a transformative innovation in aesthetic dentistry, uniting digital precision with artistic creativity. Its integration with CAD/CAM systems, 3D scanning, and artificial intelligence continues to refine clinical workflows, offering a more predictable and patient-centered approach to smile rehabilitation. Continued technological advancement and education are essential to ensure its successful and ethical implementation in routine dental practice.