A retaining device for a dental workpiece includes a retaining ring for receiving the dental workpiece, and a clamping device for clamping the dental workpiece on the retaining ring. The clamping device has a bearing surface for the dental workpiece, and the bearing surface is mounted or formed on the retaining ring and protrudes radially in the direction of the central axis. At least one clamping element is mounted movably on the retaining ring, and in a clamping position, the dental workpiece can be clamped between the clamping element and the bearing surface. The retaining ring has an inner ring element, on which the bearing surface is mounted or formed and on which the clamping element is movably mounted, an outer ring element, and a fixing device for releasably fixing the inner ring element to the outer ring element.