The ornamental design for a dentalflosser, as shown and described.
FIG. 1 is a front elevational view of a dental flosser showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right perspective view thereof; and,
FIG. 8 is a left perspective view thereof.
The handle of the dental flosser has two depressed regions on either side, said two depressed regions being separated by a non-depressed strip region, as shown in the Figures.