Check whether the zipper is stuck, misaligned, or missing teeth
Apply a small amount of graphite, soap, or zipper lubricant to the teeth
Gently work the slider up and down without forcing it
If fabric is caught, pull it out carefully with tweezers
If the slider is loose, squeeze it slightly with pliers
If the zipper separates after closing, replace the slider
If the teeth are bent, straighten them gently with pliers
If the zipper pull is broken, attach a paper clip, key ring, or replacement pull
If the zipper is missing teeth or badly damaged, replace the entire zipper
Sew the zipper area closed temporarily if an immediate fix is needed
Test the zipper several times after repairing it