Toothbrush head

FIG. 1 is a perspective view of a toothbrush head;

FIG. 2 is a front view thereof;

FIG. 3 is a left-side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Broken lines in the drawings depict portions of a toothbrush head that form no part of the claimed design.