A method of building up a dental object, which method is not carried out in vivo, the method comprising the steps of: (i) determining a three-dimensional shape of the dental object in the form of computer-processible data which represents the three-dimensional shape; (ii) providing a first component, a second component, and a third component, (iii) mixing the first component, the second component, and the third component to form a hardenable composition, the first component comprising a light-hardenable resin and a photoinitiator, the second component comprising a coloring agent, and the third component comprising a coloring agent; (iv) depositing the hardenable composition through a nozzle ; and (v) performing steps (iii) and (iv) in combination with moving the nozzle by computer control based on the computer-processible data to build up the dental object by incremental depositing the hardenable composition, wherein: the first component is supplied at first flow rate A, the second component is supplied at second flow rate B, and the third component is supplied at a third flow rate C, wherein a ratio of second flow rate B : third flow rate C is variable; wherein the mixing of the first component, the second component, and the third component provides a color-graded hardened composition, based upon the ratio of second flow rate B and third flow rate C being variable while continuously dispensing; and wherein the third component is configured to provide the hardened composition with a different material property than the second component. (i) determining a three-dimensional shape of the dental object in the form of computer-processible data which represents the three-dimensional shape; (ii) providing a first component, a second component, and a third component, (iii) mixing the first component, the second component, and the third component to form a hardenable composition, the first component comprising a light-hardenable resin and a photoinitiator, the second component comprising a coloring agent, and the third component comprising a coloring agent; (iv) depositing the hardenable composition through a nozzle ; and (v) performing steps (iii) and (iv) in combination with moving the nozzle by computer control based on the computer-processible data to build up the dental object by incremental depositing the hardenable composition, wherein: the first component is supplied at first flow rate A, the second component is supplied at second flow rate B, and the third component is supplied at a third flow rate C, wherein a ratio of second flow rate B : third flow rate C is variable; the first component is supplied at first flow rate A, the second component is supplied at second flow rate B, and the third component is supplied at a third flow rate C, wherein a ratio of second flow rate B : third flow rate C is variable; wherein the mixing of the first component, the second component, and the third component provides a color-graded hardened composition, based upon the ratio of second flow rate B and third flow rate C being variable while continuously dispensing; and wherein the third component is configured to provide the hardened composition with a different material property than the second component. <EOS>