A replaceable-head, dental care tool is disclosed, of the type including a handle element (1) and a tool element, the tool element including an engaging extension (10) having at least one flexible reed element (11) equipped with an end pawl (12), and the handle element comprising an engagement seat (2) for the engaging extension (10) which has a shoulder (2b') able to retain the pawl (12), as well as an activation button (5) in the shape of a separate button and capable of pushing on the pawl (12) to disengage it from the shoulder (2b'), the seat (2) being externally surrounded by an edge (4) of soft elastic material wherein the button (5) is circumferentially enclosed.