I claim the ornamental design for a nozzle for oral waterjet, as shown and described.
FIG. 1 is a front perspective view of the nozzle for oral waterjet of the present invention;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a first side view thereof;
FIG. 6 is a second side view thereof; and,
FIG. 7 is a rear view thereof.
The dashed broken lines depict portions of the nozzle for oral waterjet that form no part of the claim. The unevenly dashed broken lines in the drawings define the limits of claimed design and form no part of the claimed design.