The ornamental design for a mouthguard, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the office upon request and payment of the necessary fee.
FIG. 1 is an exploded perspective view of a mouthguard, showing our new design.
FIG. 2 is a perspective view of the mouthguard of FIG. 1.
FIG. 3 is a top plan view of the mouthguard of FIG. 1.
FIG. 4 is a bottom plan view of the mouthguard of FIG. 1.
FIG. 5 is a front elevation view of the mouthguard of FIG. 1; and,
FIG. 6 is a left side elevation view of the mouthguard of FIG. 1.
All surfaces not shown form no part of the claimed design.