FIG. 1 is a perspective view showing a brush head design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view showing a brush head design;
FIG. 9 is a front elevational view thereof;
FIG. 10 is a rear elevational view thereof;
FIG. 11 is a right side elevational view thereof;
FIG. 12 is a left side elevational view thereof;
FIG. 13 is a top plan view thereof;
FIG. 14 is a bottom plan view thereof;
FIG. 15 is a perspective view showing a brush head design;
FIG. 16 is a front elevational view thereof;
FIG. 17 is a rear elevational view thereof;
FIG. 18 is a right side elevational view thereof;
FIG. 19 is a left side elevational view thereof;
FIG. 20 is a top plan view thereof;
FIG. 21 is a bottom plan view thereof;
FIG. 22 is a perspective view showing a brush head design;
FIG. 23 is a front elevational view thereof;
FIG. 24 is a rear elevational view thereof;
FIG. 25 is a right side elevational view thereof;
FIG. 26 is a left side elevational view thereof;
FIG. 27 is a top plan view thereof;
FIG. 28 is a bottom plan view thereof;
FIG. 29 is a perspective view showing a brush head design;
FIG. 30 is a front elevational view thereof;
FIG. 31 is a rear elevational view thereof;
FIG. 32 is a right side elevational view thereof;
FIG. 33 is a left side elevational view thereof;
FIG. 34 is a top plan view thereof;
FIG. 35 is a bottom plan view thereof;
FIG. 36 is a perspective view showing a brush head design;
FIG. 37 is a front elevational view thereof;
FIG. 38 is a rear elevational view thereof;
FIG. 39 is a right side elevational view thereof;
FIG. 40 is a left side elevational view thereof;
FIG. 41 is a top plan view thereof; and,
FIG. 42 is a bottom plan view thereof.
The broken lines in the drawings depict portions of the brush head that form no part of the claimed design.