The pursuit of an attractive smile has become an integral aspect of modern dental practice. In today's esthetically driven society, tooth color plays a crucial role in shaping an individual's self-confidence, social interactions, and overall perception of oral health. Discoloration of teeth, whether caused by aging, dietary habits, developmental disturbances, trauma, systemic conditions, or restorative procedures, often presents a significant esthetic concern for patients seeking dental treatment. As a result, tooth whitening and bleaching procedures have emerged as some of the most sought-after treatments in contemporary dentistry. Bleaching in Dentistry offers a comprehensive and evidence-based exploration of one of the most conservative and effective esthetic treatment modalities available today. This work provides an in-depth understanding of the biological, chemical, and clinical principles underlying dental bleaching while integrating historical perspectives, contemporary techniques, and emerging advancements in the field.