FIG. 1 is a left side and front perspective view of a first embodiment of a toothbrush head, showing my design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a left side and front perspective view of a second embodiment of a toothbrush head;
FIG. 9 is a right side elevation view thereof;
FIG. 10 is a left side elevation view thereof;
FIG. 11 is a front elevation view thereof;
FIG. 12 is a rear elevation view thereof;
FIG. 13 is a top plan view thereof; and,
FIG. 14 is a bottom plan view thereof.
The broken line showing in the Figures illustrates portions of the toothbrush head and forms no part of the claimed design.