Abstract: A system for fastening a dental prosthesis comprising a support element to be fitted in the mouth and a fastening element to be fitted on the prosthesis with the support element being designed to detachably retain said fastening element. According to the invention, the support element comprises a bottom portion and a top portion. At least the top portion is made, at least in part, of magnetic material, and the support element has an essentially oval contour in sideview and includes attaching means for attaching it to at least one dental element. The fastening element comprises a cover plate of magnetically receptive material capable of at least partially embracing the support element.