Cut in between two of the prong pieces of the comb on the side that the zipper has disconnected from.
Thread the zipper through to get the tracks lined back up.
If the zipper doesn't zip, gently clamp down the back butt end of the zipper with pliers.
Re-thread the zipper.
Use a needle and thread to create a backstop for the zipper above where the snip was made.
Sew around in a circle until a nice little thread stop for the zipper is created.
The zipper is now fixed and won't come off the track again.
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