The invention relates to a nozzle (300) for a polisher, including a body (301) that extends between a proximal portion (100) to be connected to a handle part, and a distal portion (200), said body including a first channel (310), for supplying a polishing powder, and a second channel (320) for supplying a fluid. The distal portion (200) comprises a chamber (230) arranged near the free end (210) of said distal portion (200), the first and second channels (320, 310) leading into said chamber (230). The chamber comprises two side openings (233, 234), each of which extend in a plane (P
