Dental caries is an irreversible, microbial disease affecting the exposed hard tissues of the oral cavity which causes demineralization of the organic structure & dissolution of the inorganic structure leading to development of cavity. Dental caries is one of the most chronic diseases of modern dentistry. Although, it is a challenge to diagnose & treat carious lesions successfully. This book covers the history, related reviews, conventional & advanced diagnostic aids required for diagnosis of dental caries. It also provides various diagnostic tests which help in diagnosis of dental caries.