FIG. 1 is a front view of a toothbrush showing my new design;
FIG. 2 is a bottom plan view thereof on an enlarged scale;
FIG. 3 is a top plan view thereof on an enlarged scale;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a right side elevation view thereof, the left side view being a mirror image thereof; and,
FIG. 6 is a front perspective view thereof.
The broken line showing of the bristles in FIGS. 1, 3, 5 and 6 is for illustrative purposes only and forms no part of the claimed design.