1. A method for identifying one or more tooth regions, comprising: generating a first threshold image from a first image of the tooth by selecting intensity data values higher than a first predetermined threshold value c 1 ; generating a second threshold image from a second image of the tooth by selecting intensity data values higher than a second predetermined threshold value c 2 ; generating a preliminary tooth regions image that defines at least a first tooth region from the intersection of the first and second threshold images; generating a reference binary image from the first image by selecting intensity data values higher than a third predetermined threshold value c 3 , wherein threshold value c 3 exceeds threshold value c 1 ; and generating a refined tooth regions image from at least the first tooth region in the preliminary tooth regions image, wherein the at least the first tooth region is connected to objects in the reference binary image.