FIG. 1 is a top and rear perspective view of a mouth-piece showing my new design;

FIG. 2 is a bottom and rear perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation thereof shown inverted and taken in the direction of line 4—4 in FIG. 3;

FIG. 5 is a top plan view thereof;

FIG. 6 is a side elevation thereof, turned upright taken on line 6—6 in FIG. 5, the side opposite being a mirror image; and,

FIG. 7 is a rear elevation thereof taken on line 5—5 in FIG. 5.