Abstract: Tooth whitening is a common procedure used to improve appearance of a discolored tooth. Many parameters have been described that based on the chemical influence of the bleaching agent on enamel-dentin surface. The final appearance may be compatible to the "brightness" of the tooth surface. In other terms the reflection of light from the bleached tooth area was assessed using digital methods. Luminosity as a method of photometry on measuring the luminance of basic colors may be considered as the simplest method of measuring the light reflection of green, blue and red. Concluding, the use of 38% hydrogen peroxide supported by diode laser slightly increased luminosity using digital photometry.