FIG. 1 is a front right perspective view of an electric toothbrush brush head according to an embodiment of the new design;
FIG. 2 is a rear left perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a right side elevation view thereof,
FIG. 6 is a left side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
All broken lines shown in the drawings illustrate environmental structure and form no part of the claimed design. The long-short-long broken lines in the drawings define a boundary of the claimed design and form no part thereof. The difference in grayscale shading represents a contrast in coloring.