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; 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.