FIG. 1 is a front view of a head portion of a toothbrush according to the new design;
FIG. 2 is a right side view thereof, the left side view being the same;
FIG. 3 is a rear view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a front perspective view thereof:
FIG. 7 is a rear perspective view thereof;
FIG. 8 is a close up side view of the head portion thereof;
FIG. 9 is a close up rear view of the head portion thereof; and,
FIG. 10 is a close up rear perspective view of the head portion thereof.
All broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design.