The ornamental design for a sprayinghead for oralirrigator, as shown and described.
FIG. 1 is a front view of a spraying head for oral irrigator showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken line shown in FIG. 6 is included for the purpose of illustrating portions of the spraying head for oral irrigator and forms no part of the claimed design.