Nowadays we use laser technology in various branches of medicine and dental medicine. Term LASER stands for – Light Amplification of Stimulated Emission of Radiation. Laser is a mechanical device which produces and emits a beam of light through the space without dispersing and losing additional energy. Photons are carriers of the laser beam. Laser medium is composed out of atoms in which the electrons of various and specific energy outputs are distributed in different orbits. When the specific electron from the higher orbit travels to the lower one, it emits energy in a form of a photon. Laser beam is monochrome, coherent and focused energy of light transformed into thermal one, that has therapeutic effect on tissue. Lasers are differentiated by wave length, by different kinds of active media, by distribution of emitted radiation, and by magnitude of power. The characteristics of laser beam are the ability to focus on relatively small surfaces with great accuracy with a small amount of energy. Effect of the laser on the tissue depends on the structure, water composition, blood circulation, and the specifics of the light beam (wave length, density, amount of energy). There are three kinds of interactions between laser and tissue – photochemical, photothermal and photoionizing effect. Currently, there are two kinds of lasers in use ; for hard and soft tissue. Laser technology is applied widely in dental medicine as in orthodontics, oral medicine and chirurgy, parodontology, restorative dentistry.