FIG. 1 is a left, frontal perspective view of a toothbrush showing my new design;
FIG. 2 is a right, rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof, the left side view being a mirror image thereto;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a top view thereof.
The dashed lines are for purposes of illustration and form no part of the claimed design. The stippling in the FIGURES represents a difference in appearance by color, texture, and/or material.