Laser stands for "light amplification by stimulated emission of radiation." Laser instruments emit a thin, concentrated beam of light energy. Light is calculated in wavelengths, and each wavelength generates an individual thermal output, so dentists can predict its interaction with a particular tissue. Consequently, some wavelengths are more conducive to performing certain procedures than others. For example, there are select lasers used for soft tissue surgeries while others are effective on hard tissues like tooth enamel and bone, notes the NJOMS.