Orthodontic spring

The ornamental design for an orthodontic spring, as shown and described.

FIG. 1 is a front perspective view of an orthodontic spring showing my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a left side elevational view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a right side elevational view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

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