The ornamental design for a therapeutic facemask, as shown and described.
FIG. 1 is a perspective view of the face mask of the invention;
FIG. 2 is a front elevational view of the face mask;
FIG. 3 is a rear elevational view of the face mask;
FIG. 4 is a bottom view of the face mask;
FIG. 5 is a top view of the face mask;
FIG. 6 is an end view of the mask, viewing the mask from the right side of FIG. 2; and,
FIG. 7 is an end view of the mask, viewing the mask from the left side of FIG. 2.
The broken line showing of parts of the drawings is included for the purpose of illustrating use and environment and forms no part of the claimed design.