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The ornamental design for a dental floss holder, as shown and described. |
FIG. 1 is a top perspective view of a dental floss holder showing my new design;
FIG. 2 is a top plan view;
FIG. 3 is a right side elevational view;
FIG. 4 is a rear elevational view;
FIG. 5 is a front elevational view;
FIG. 6 is a left side elevational view; and
FIG. 7 is a bottom plan view.
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