The invention relates to a method for producing a dental aidfrom a thermoplastic film or plate, wherein a digitalthree-dimensional working model is created in a computer-aidedmanner using a three-dimensional data set of at least onepart of an upper jaw and/or lower jaw; a physical workingmodel is produced based on the digital working model; theplastic film or plate is deep drawn on the physical workingmodel inside a deep-drawing device; the dental aid is createdfrom the deep drawn plastic film or plate by separation alonga cutting line; prior to producing the physical workingmodel, the digital working model is supplemented with anauxiliary structure automatically and/or via manual inputmeans; the auxiliary structure is configured as an elevationor a depression and extends along a digital cutting linemodel in the working model; and the digital cutting linemodel is created in the digital working model automaticallyand/or via manual input means.