Investigations are an extension of the physical examination in which tissue, blood, other specimens are obtained from the patient and subjected to microscopic, biochemical, microbiological or immunologic examination. In essence, chairside investigations are fundamental to the practice of dentistry, allowing for timely, accurate diagnosis, personalized treatment planning, patient education, and ongoing monitoring of oral health. This book comprises of all the diagnostic procedures which can be integrated directly into the clinical setting and dentists can provide comprehensive care that meets the needs of their patients efficiently and effectively.