Provided is a brush body (21) for selectively applying localized currents, for oral care, to oral interstices such as periodontal pockets. Said brush body has a plurality of bristle bunches (24) in a head section (23). Each bristle bunch (24) contains bristles (25), each bristle having a core (25x) and a sheath (25y). Each core comprises a conductive member and each sheath comprises an insulating member that covers that core (25x). At the tip (25a) of each bristle (25), the core (25x) protrudes further than the sheath (25y) and acts as an electrode.
