FIG. 1 is a perspective view of a toothbrush head showing our new design, the broken line structure being for illustrative purposes only and forming no part of the claimed design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a left side elevational view thereof, the right side being a mirror image;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevational view thereof; and,
FIG. 6 is a rear elevational view thereof.