Method for determining optical characteristics comprising color characteristics, characteristics of translucency, fluorescence characteristics or features of surface texture of a tooth, comprising the steps of: - preparing image data corresponding to the tooth with an intraoral camera (383) - dividing said image data into a plurality of regions (398), in which measurements of the optical characteristics of the tooth are made in a plurality of regions and comprising the steps of - measuring the tooth by moving a probe (381) of a reflectometer (380) near the tooth, wherein the probe provides light to the tooth surface (20, 396) from one or more light sources (5, 11) and receives light reflected from the tooth through one or more light receivers (7) - determining the intensity of reflected light received by one or more of said one or more light receivers with first sensors (8) and - measuring the optical characteristics of the tooth with second sensors (8) based on light received by one or more of the one or more light receivers (7) in response to determinations intensity made by the first sensors, producing measurement data measured indicative of the optical characteristics of the tooth wherein the measured data from the plurality of regions are stored in a data record of the patient in a computer system - generate data determining a match between the measured data and one or more colored dental guides and - store measures the optical characteristics of the tooth along with the image prepared tooth and tooth image divided into a plurality of regions in the patient data record.Método para determinar las características ópticas que comprenden características de color, características de translucidez, características de fluorescencia o características de textura superficial de un diente, que comprende las etapas de: - preparar datos de imagen correspondientes al diente con una cámara intraoral (383) - dividir dichos datos de imagen en una pluralidad de regiones (398), en
