The ornamental design for a dental flossdispenser, as shown and described.
FIG. 1 is a front perspective view of a dental floss dispenser showing my
new design in full lines with the broken lines showing the floss and human
hand being for illustrative purposes only and forming no part of the
claimed design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a left side elevational view thereof, with the right side
elevational view being a mere image; and,