1. A dental shade matching device, comprising: a camera body to capture an image of one or more target teeth, and having at least one chromatic illuminant module to emit chromatic light that provides specific frequencies of visible light emitted at sequential time intervals, and the camera body captures a series of images under all these illumination separately or sequentially; an opaque intra-oral compartment snugly adapted to be received in a human mouth, said intra-oral compartment having a soft tissue retracting part for retracting the soft tissue around the target tooth, and a stop for supporting the target teeth in a desirable orientation; an opaque cover shield body having one end attached tightly to the camera body and another end connected to the intra-oral compartment; one or more holders for holding one or more shade tabs in place and releasably attached to the intra-oral compartment; and a color matching module comprising a microprocessor, said color matching module being operably connected to the camera body to receive the captured images containing color and translucency information of the target tooth and/or shade tabs, and then to process the images based on a content-based algorithm for automatic shade matching between the target tooth and the shade tabs for each of the captured images, so as to achieve an optimal dental prosthesis.