A method for producing a brush head, in particular a toothbrush head, or a part thereof comprising the steps of - providing a cleaning element carrier comprising cavities (31,32), wherein the cleaning element carrier represents a first half of a mold; - providing at least one two-component- -cleaning element wherein the 2K-cleaning element comprises a first component and a second component meaning that the 2K-cleaning element comprises at least two different geometric forms made of two different materials, wherein the first and second component of the 2K-cleaning element consists of a hard plastic material and an elastomeric cleaning element, of a hard or soft plastic material and an indicator element, of a hard or soft plastic material and a bundle of bristles, of a hard or soft plastic material and a bundle of super-thin tapered bristles, of a hard or soft plastic material and a chemical releasing element or a combination thereof and wherein the second component comprise at least one undercut, wherein the at least one undercut of the second component is positioned outside the cleaning element carrier so that it will be embedded by over-molding into the brush head to be formed thereby connecting the 2K-cleaning element and the brush head physically; - inserting the at least one 2K-cleaning element and one or more bristle tuft(s) into the cleaning element carrier, wherein the first component of the at least one 2K-cleaning element and a first part of the one or more bristle tuft(s) are covered by the cleaning element carrier; - forming a mold cavity by combining the cleaning element carrier with at least a second mold half, wherein the second component of the at least one 2K-cleaning element including the at least one undercut and a second part of the one or more bristle tuft(s) are located inside the mold cavity; - injecting plastic material into the mold cavity, wherein the second component of the at least one 2K-cleaning element including the at least one undercut and the second part(s) of the one or more bristle tuft(s) are over-molded by the injected plastic material and wherein the brush head or the part thereof is formed thereby, and wherein the 2K-cleaning element is mounted physically into the brush head by the at least one undercut. - providing a cleaning element carrier comprising cavities (31,32), wherein the cleaning element carrier represents a first half of a mold; - providing at least one two-component- -cleaning element wherein the 2K-cleaning element comprises a first component and a second component meaning that the 2K-cleaning element comprises at least two different geometric forms made of two different materials, wherein the first and second component of the 2K-cleaning element consists of a hard plastic material and an elastomeric cleaning element, of a hard or soft plastic material and an indicator element, of a hard or soft plastic material and a bundle of bristles, of a hard or soft plastic material and a bundle of super-thin tapered bristles, of a hard or soft plastic material and a chemical releasing element or a combination thereof and wherein the second component comprise at least one undercut, wherein the at least one undercut of the second component is positioned outside the cleaning element carrier so that it will be embedded by over-molding into the brush head to be formed thereby connecting the 2K-cleaning element and the brush head physically; - inserting the at least one 2K-cleaning element and one or more bristle tuft(s) into the cleaning element carrier, wherein the first component of the at least one 2K-cleaning element and a first part of the one or more bristle tuft(s) are covered by the cleaning element carrier; - forming a mold cavity by combining the cleaning element carrier with at least a second mold half, wherein the second component of the at least one 2K-cleaning element including the at least one undercut and a second part of the one or more bristle tuft(s) are located inside the mold cavity; - injecting plastic material into the mold cavity, wherein the second component of the at least one 2K-cleaning element including the at least one undercut and the second part(s) of the one or more bristle tuft(s) are over-molded by the injected plastic material and wherein the brush head or the part thereof is formed thereby, and wherein the 2K-cleaning element is mounted physically into the brush head by the at least one undercut.