I split zippers constantly, and as it turns out, it’s generally a result of overuse and “pulling” outward on the zipper causing the mouth of the zipper to open slowly. So whether your zipper comes completely apart of if the teeth pop open at a different point in the zipper, there is an easy fix for it and you will find it in the link provided below:
All you will need is a split zipper, a flathead screw driver, and pliers.
How to Fix a Zipper Split (with Pictures) | eHow
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