MicroRNA-203(miR-203) plays important roles in the development and progression of tumor and inflammation by targeting and regulating various downstream mediators at different levels. MiR-203 is a novel diagnostic and prognostic marker because of its therapeutic potential. The intensive investigation of mechanism in tumor development within micro-environment of inflammation has made the potent role of miR-203 in regulating inflammation-related tumor a new controversial issue. Recently, the regulatory mechanisms of miR-203 have been investigated in oral diseases. This mini-review focuses on the biological function of miR-203, especially its role in oral diseases.