A computer implemented method for digitally designing a modified dental setup on a digital 3D dental model representing at least a part of the teeth of a patient comprising the steps of: - loading, from a data source, a pre-treatment digital 2D image of at least a part of the teeth of the patient; - loading, from a data source or via scanning, a digital 3D representation of the at least a part of the teeth of the patient; - obtaining a proposed digital 2D image of a desired dental setup by digitally creating, through user interaction, at least one digital tooth modification based on the pre-treatment digital 2D image ; characterized by - determining a transformation by estimating a camera view for the pre-treatment digital 2D image based on a correlation of at least one facial feature in the pre-treatment digital 2D image and corresponding at least one facial feature in the digital 3D representation , wherein determining the transformation based on the correlation comprises identifying corresponding points of at least one facial feature in the pre-treatment digital 2D image and corresponding at least one facial feature in the digital 3D representation , and the at least one facial feature comprises at least a part of one or more of the teeth visible in the digital pre-treatment 2D image and represented in the digital 3D representation ; and - transferring the at least one digital tooth modification from the proposed digital 2D image to the digital 3D representation according to the transformation. - loading, from a data source, a pre-treatment digital 2D image of at least a part of the teeth of the patient; - loading, from a data source or via scanning, a digital 3D representation of the at least a part of the teeth of the patient; - obtaining a proposed digital 2D image of a desired dental setup by digitally creating, through user interaction, at least one digital tooth modification based on the pre-treatment digital 2D image ; characterized by - determining a transformation by estimating a camera view for the pre-treatment digital 2D image based on a correlation of at least one facial feature in the pre-treatment digital 2D image and corresponding at least one facial feature in the digital 3D representation , wherein determining the transformation based on the correlation comprises identifying corresponding points of at least one facial feature in the pre-treatment digital 2D image and corresponding at least one facial feature in the digital 3D representation , and the at least one facial feature comprises at least a part of one or more of the teeth visible in the digital pre-treatment 2D image and represented in the digital 3D representation ; and determining the transformation based on the correlation comprises identifying corresponding points of at least one facial feature in the pre-treatment digital 2D image and corresponding at least one facial feature in the digital 3D representation , and the at least one facial feature comprises at least a part of one or more of the teeth visible in the digital pre-treatment 2D image and represented in the digital 3D representation ; and - transferring the at least one digital tooth modification from the proposed digital 2D image to the digital 3D representation according to the transformation. <EOS>