A device for generating data on a clear aligner (100) is equipped with a module (30) for generating the data on the clear aligner. The module generates 3D data relating to the clear aligner based on 3D data that contains data on a current arrangement of patent's teeth and on a gingival internal structure, the module including a first module (31) that receives data on a current dental state from a scanning apparatus that scans patient's teeth； a second module (32) that generates 3D data on a state of the patient's teeth and of the vicinity of the patient's teeth based on data that results from the scanning； a third module (33) that generates data relating to a 3D clear aligner with a predetermined thickness； and a fourth module (34) that processes the data relating to the 3D clear aligner in such a manner that at least one of a shape and a feature of the 3D clear aligner is changed.
