I claim the ornamental design for a nozzle for oral waterjet, as shown and described.
FIG. 1 is a front perspective view of a nozzle for oral waterjet of the present invention;
FIG. 2 is a front 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 broken lines shown represent unclaimed subject matter and form no part of the claimed design. Additionally, the unevenly broken lines in the drawings define the limits of the claimed design.