The world of dentistry is ever evolving. Lasers are one of the recent advances in the field of dentistry. Introduction of laser has made dentistry painless with advantages of minimal bleeding, minimal post-operative discomfort, precise operator control and minimum scaring with better aesthetic results. This book encompasses history, classification, mechanism of action, physics, tissue interactions, safety and application of laser in oral medicine along with its advantages and disadvantages. This book would be of immense help for dentists practising laser dentistry or general dentists interested in practising laser dentistry.