FIG. 1 is a front, top and right side perspective view of a toothbrush head, showing our design.
FIG. 2 is a front elevation view thereof.
FIG. 3 is a rear elevation view thereof.
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line in FIG. 7 depicts a boundary and forms no part of the claimed design.