A method of producing a brush which comprises a bristle carrier made from a thermoplastic resin having a front side and a back side and at least one anchoring opening, in which at least one bristle made from a thermoplastic resin is inserted and anchored therein without using an anchor, so that it protrudes from the front side of the bristle carrier, characterized by the following steps: the at least one bristle is accommodated in a receiving opening of a tool part, the at least one bristle is inserted, by its fastening end, into an anchoring opening in the bristle carrier, which has been formed during producing the bristle carrier, while the at least one bristle is still located in the receiving opening, the distance of the tool part to the bristle carrier is reduced, so that the tool part contacts the bristle carrier, the front side of the bristle carrier is brought to a temperature that is below the melting temperature of the bristle material and/or the bristle carrier material, in particular that is a maximum of 85% in °C of the respective melting temperature of the bristle material and/or the bristle carrier material, the tool part applies a pressure force to the heated bristle carrier and reshapes the bristle carrier at least in the area of the edge surrounding the anchoring opening while reducing the cross-section of the anchoring opening in such a way that the at least one bristle is embedded and anchored in the anchoring opening, and the distance of the tool part to the bristle carrier is increased, so that the at least one bristle is pulled out of the receiving opening, wherein the application of the pressure force is carried out in an apparatus in which the bristle carrier is contacted on its front side by a tool part and on its back side by a holder, while the pressure force is applied to the bristle carrier, wherein the apparatus is moved to stop during application of the pressure force, so that the front faces of the holder and of the tool part are in full surface contact around the bristle carrier, and after a feed motion of the tool part and the bristle carrier relative to each other, which is completed upon reaching a closed position of the apparatus, the pressure force is applied to the bristle carrier in the closed position during a predetermined dwell time, wherein the dwell time is at least 1 second. the at least one bristle is accommodated in a receiving opening of a tool part, the at least one bristle is inserted, by its fastening end, into an anchoring opening in the bristle carrier, which has been formed during producing the bristle carrier, while the at least one bristle is still located in the receiving opening, the distance of the tool part to the bristle carrier is reduced, so that the tool part contacts the bristle carrier, the front side of the bristle carrier is brought to a temperature that is below the melting temperature of the bristle material and/or the bristle carrier material, in particular that is a maximum of 85% in °C of the respective melting temperature of the bristle material and/or the bristle carrier material, the tool part applies a pressure force to the heated bristle carrier and reshapes the bristle carrier at least in the area of the edge surrounding the anchoring opening while reducing the cross-section of the anchoring opening in such a way that the at least one bristle is embedded and anchored in the anchoring opening, and the distance of the tool part to the bristle carrier is increased, so that the at least one bristle is pulled out of the receiving opening, wherein the application of the pressure force is carried out in an apparatus in which the bristle carrier is contacted on its front side by a tool part and on its back side by a holder, while the pressure force is applied to the bristle carrier, wherein the apparatus is moved to stop during application of the pressure force, so that the front faces of the holder and of the tool part are in full surface contact around the bristle carrier, and after a feed motion of the tool part and the bristle carrier relative to each other, which is completed upon reaching a closed position of the apparatus, the pressure force is applied to the bristle carrier in the closed position during a predetermined dwell time, wherein the dwell time is at least 1 second.