Abstract: The invention proposes a precision brushing and combing device, allowing a top-quality, consistent, faultless and industrial implementation. To do this, the invention provides a geometrical bristle structure adjusted with precision distance-wise and angle-wise with respect to a reference, as well as dimension-wise, with mold implementation by wire spark erosion. In an example embodiment, the plastic-injection tool comprises at least one block assembly consisting of several steel plates, at least one row of cavities each intended to form the main portion of a bristle, machined either side of the surface separating two adjacent plates, and a closing-up element, disposed at the end of at least one row of cavities, in order to form the free end surface of the bristles.