FIG. 1 is perspective view as seen from the top, front and right side of a toothbrush handle showing our new design;

FIG. 2 is a reduced top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof where the left side view is a mirror image (unclaimed environmental structure being shown in broken lines);

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design.