FIG. 1 is a front, top, right perspective view of an oral irrigator showing the claimed design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a rear, bottom, right perspective view thereof.
The broken lines in the figures depict portions of the oral irrigator that form no part of the claimed design.