The History of X-rays and Their Evolution in Modern Medicine X-rays are among the most significant scientific discoveries, having revolutionized the field of medicine and medical diagnostics. They have enabled physicians to visualize the internal structures of the human body without the need for surgical intervention. Today, they serve as an essential tool for diagnosing a wide range of diseases and injuries, and they play a vital role in dentistry and modern medical imaging. The history of X-rays began on November 8, 1895, when the German physicist Wilhelm Conrad Röntgen discovered a new type of radiation while conducting experiments with electrical discharge tubes and cathode rays. Röntgen observed that these rays could penetrate certain materials and reveal the internal structures of objects; he termed them "X-rays" due to their then-unknown nature. One of the earliest and most notable applications of this discovery was an X-ray image of his wife’s hand, which clearly showed the bones and her wedding ring—a milestone that marked the beginning of a new era in medical diagnostics. In 1901, Röntgen was awarded the first Nobel Prize in Physics in recognition of his groundbreaking discovery. Following this breakthrough, scientists and physicians began to explore the medical potential of X-rays. They were soon integrated into hospitals and medical centers to diagnose fractures and conditions affecting the bones and the chest. The early years of their use saw rapid advancements in imaging technology, despite the limitations of the equipment and a lack of sufficient understanding regarding the risks of radiation exposure at the time. The early, unregulated use of X-rays led to injuries linked to excessive exposure, which subsequently fostered a greater focus on radiation protection and safety measures. In the field of dentistry, X-rays were adopted shortly after their discovery. In 1896, German dentist Otto Walkhoff produced one of the first dental radiographs using an imaging plate placed inside the mouth—a process that, at the time, required a significantly longer exposure duration compared to modern techniques. Over time, X-ray equipment and intraoral and extraoral imaging methods evolved. Radiographs became an essential tool for detecting dental caries, periapical lesions, impacted teeth, and alveolar bone diseases, while also assisting in the planning of endodontic, surgical, and prosthetic treatments. The twentieth century witnessed significant scientific and technical advancements in radiology, including improvements to X-ray tubes, the development of advanced recording and imaging systems, reduced exposure times, and enhanced image quality. Furthermore, the emergence of digital imaging led to the gradual phasing out of traditional film in many healthcare institutions, facilitating faster access to images, simplifying their storage and sharing, and improving the overall efficiency of the diagnostic process. Among the most notable recent developments is the emergence of computed tomography (CT)—which provides cross-sectional images of organs and tissues—and cone-beam computed tomography (CBCT). The latter is widely used in dentistry to produce three-dimensional images of the teeth, jaws, and surrounding structures, facilitating precise planning for various therapeutic and surgical procedures. Given this continuous evolution, radiation protection has become an essential component of medical practice. The safe use of X-rays requires that any examination be medically justified, ensuring the lowest reasonably achievable radiation dose while still obtaining a diagnostic-quality image, all while adhering to established safety protocols to protect both patients and healthcare personnel. In conclusion, the discovery of X-rays marked a significant turning point in the history of medical science, contributing to the advancement of diagnostic methods and the improvement of healthcare quality. As technological progress continues, X-rays remain pivotal in both medicine and dentistry, underscoring the importance of balancing diagnostic accuracy with the responsible and safe use of radiation.