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