A face scanning and positioning structure used for a full denture includes an irregularly shaped body, development projections, and concave portions. The irregularly shaped body defines an asymmetrical face portion along an X-axis, an asymmetrical side portion along a Y-axis, and a thickness along a Z-axis. The development projections are arranged on the asymmetrical face portion and the asymmetrical side portion at predetermined positions. The development projections protrude outwardly. The concave portions are arranged on the asymmetrical face portion and the asymmetrical side portion at predetermined positions. The concave portions each have a concave shape. Through the development projections and the concave portions, the irregularly shaped body is in the form of an asymmetrical structure along the X-axis, the Y-axis, and the Z-axis. Through the irregular protrusions and concave portions, the face scanning and positioning structure can effectively reduce the image overlay error of a specific axis.
