FIG. 1 is a front view of a toothbrush according to the new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof, the left side view being a mirror image;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front perspective view thereof; and,

FIG. 7 is a rear perspective view thereof.

All broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design. The multiple strands making up the bristle tufts are partially shown for ease of illustration.