Abstract: The invention relates to a device for milling and polishing methacrylate, consisting essentially of a saw or milling blade (2) having multiple teeth that is integrally attached in an axial manner to a plate body (1) having the same diameter as the saw or milling blade (2) such that same acts as a support for said saw blade (2) and comprises an insert (3, 3?) having at least one diamond tip (31), which is located in a position near the outer perimeter of said saw blade (2); and wherein said insert (3, 3?) is anchored to the support plate (1) and externally enclosed by the saw blade (2), such that only the edge of the diamond tip (31) of the insert (3, 3?) protrudes with respect to the surface of the saw blade (2).