The past decade has seen a veritable explosion of research into the clinical applications of lasers in dental practice, where they can be used as an adjunct or alternative to traditional approaches. It has been used in different areas of medicine and surgery. Lasers in periodontal treatment could be used for calculus detection, scaling and root planing, reduction of periodontal pathogens and their products, gain of new attachment, as well as periodontal plastic surgery. These lasers have some shortcomings, such as thermal damage to the target and surrounding tissues. The wavelength affects both the clinical applications and design of the laser. This book will enlighten the dentists about the clinical applications of different types of lasers, their advantages and limitations along with the possible risk of laser and its precautions.