We claim the ornamental design for an apparatus for treatment of mouth ulcers, as shown and described.
FIG. 1 is a front, top perspective view of an apparatus for treatment of mouth ulcers, showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a rear, bottom perspective view thereof; and,
FIG. 9 is a rear, top perspective view thereof.
The dash-dash broken lines in the drawings show portions of the apparatus for treatment of mouth ulcers which form no part of the claimed design. The dot-dash broken lines in the drawings define the bounds of the claimed design and form no part thereof.