Laser is the acronym for "Light Amplification by Stimulated Emission of Radiation". It has wide applications in the world of medicine and dentistry. Light and other forms of electromagnetic energy are composed of elementary particles known as photons (quantum of light). In dentistry it has varied applications in its all branches. In field of orthodontics it has wide range of applications like Newer brackets with laser cut bracket bases- Laser welding - Laser scanning- Etching - Bonding- Debonding - Pain control with LLLT- Effect on tooth movement - Effect on bone regeneration- Enamel decalcification reduction - Soft tissue applications likeGingivectomy/gingivoplasty FrenectomyExposure of unerupted toothPhotostimulation of apthous ulcers etc- Holographic studies.This book covers the basic principles of lasers, its advantages disadvantages, risks, types and extensively about its applications in the branch of orthodontics