The ornamental design for a head for electricaltoothbrush, as shown and described.
FIG. 1 is a bottom view of a head for electrical toothbrush showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a rear perspective view thereof; and,
FIG. 8 is a front perspective view thereof.
The broken lines shown in the figures that are immediately adjacent to the solid line areas and define unshaded regions represent the bounds of the claim. All other broken lines, including the features within broken line boundaries, are directed to environment. The broken lines form no part of the claimed design.