FIG. 1 is a front perspective view of an electric toothbrush handle showing my new design, as seen from the top right side;

FIG. 2 is a rear perspective view thereof, as seen from the top left side;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevational view thereof; the left side elevational view being a mirror image; and,

FIG. 7 is a rear elevational view thereof.

The broken lines showing a U-shape within a U-shape on the lower portion of the handle are for illustrative purposes only and form no part of the claimed design.