An assistance system for dental treatment, particularly for changing tooth color, is provided herein, including a measuring device for determining tooth data. The data captured is transmitted from the measuring device to a data processing means. The data processing means includes a camera for capturing a tooth mage. Using a selection means, a color change level for the tooth image or the teeth is specified and, thereafter, the tooth image is adapted based on the selected color change level using an adaptation means. Thus, it is possible to show the patient an image of a color change of his teeth caused by the dental treatment in relation to the appearance of his face, so the patient can judge a color change in relation to his or her face.
