An accessory section (100; 700), namely a brush section, suitable for connection to a handle section (200) of an oral hygiene device (1), comprising: an accessory housing (150) having a first coupling structure (152) suitable for establishing a connection with a second coupling structure (252) of the handle section (200); at least one functional element (130) mounted on the accessory housing (150) to drive the movement; a motion transmitter (110; 710) that extends into a cavity (159) formed within the accessory housing (150), the motion transmitter (110; 710) being functionally connected at one end (110B) with the element functional (130); and a first magnetic coupling element (120; 720) disposed at another end (110A) of the motion transmitter (110; 710), the first magnetic coupling element (120; 720) comprising at least one permanent magnet or a magnetizable element suitable for establishing a magnetic connection with a second magnetic coupling element (220) provided in the handle section (200); wherein the motion transmitter comprises a rod element (716), characterized in that the rod element (716) is pivotally mounted on a support element (712) that has a cavity (711) that accommodates, at least partially , the first magnetic coupling element (120; 720).Una sección (100; 700) de accesorio, concretamente una sección de cepillo, adecuada para conectarla a una sección (200) de mango de un dispositivo (1) de higiene bucodental, que comprende: una carcasa (150) de accesorio que tiene una primera estructura (152) de acoplamiento adecuada para establecer una conexión con una segunda estructura (252) de acoplamiento de la sección (200) de mango; al menos un elemento funcional (130) montado en la carcasa (150) de accesorio para accionar el movimiento; un transmisor (110; 710) de movimiento que se extiende en una cavidad (159) formada dentro de la carcasa (150) de accesorio, estando el transmisor (110; 710) de movimiento funcionalmente conectado en un extremo (110B) con el