The ornamental design for a teethwhiteningdevice, as shown and described.
FIG. 1 is a front top perspective view of a teeth whitening device, showing a new design;
FIG. 2 is a rear bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right-side elevation thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines shown in the drawings depict portions of the teeth whitening device that form no part of the claimed design.
References to “side”, “front” and “rear” in the figure descriptions are not meant to require certain in-use orientations, teeth bleaching device according to the claimed design may be used in multiple orientations and configurations.