The invention provides a method and device for analyzing an oral tissue and especially analyzing the tooth tissue of a tested target as well as a dental analysis system. An oral image of the tested target is processed, for example a color value of the oral image is adjusted, so that a to-be-analyzed oral tissue area, for example, all or partial teeth (such as at least one tooth or at least two teeth) in the oral cavity is highlighted. Therefore, the highlighted to-be-analyzed oral tissue area can be selected so as to be analyzed. By adopting the method and system, the health situation of the teeth can be conveniently and rapidly judged, the tested target does not need to be photographed for multiple times, and a complicated programming algorithm is not needed.
