FIG. 1 is a perspective view showing a front and right side of a portion of a toothbrush showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left-side view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a perspective view showing a front and right side of another embodiment of a portion of a toothbrush;
FIG. 9 is a front view thereof;
FIG. 10 is a left-side view thereof;
FIG. 11 is a rear view thereof;
FIG. 12 is a right-side view thereof;
FIG. 13 is a top view thereof; and,
FIG. 14 is a bottom view thereof.
The broken lines are shown for environmental purposes and form no part of the claimed design.