FIG. 1 is an isometric view from the front of a toothbrush handle incorporating the design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a right-side view thereof;
FIG. 5 is a left-side view thereof;
FIG. 6 is a front-end view thereof; and,
FIG. 7 is a back-end view thereof.
The dashed-line element showing a toothbrush head is for environmental purposes only and does not otherwise form part of the claimed design.