When your zipper is stuck it feels like it's getting caught on something. The zipper might not come down at all.The best way to fix this? Grab a graphite pencil and rub the pencil tip on the teeth. Try it again and it should work. If that doesn't work, it's time to move on to a lubricant. Windex is good because it's not oil-based, but you can also use bar soap, or lip balm. Start with the zipper all the way up, and slowly apply the lubricant to the teeth. Then inch the zipper down some more, reapply, and continue doing that until the zipper comes all the way down. This is especially handy to fix a zipper stuck in the fabric itself.
The Teeth Don't Close (or They Keep Popping Open)
One of the most annoying problems with a zipper is when the teeth won't close. The problem comes from a few different reasons. Sometimes the above trick of using a pencil (or a bar of soap) will smooth out the teeth enough so they'll work again.
The Slider Broke Off
to cut it off. Once that's done, reattach the new zipper slider by sliding it back onto the teeth. That's it, you're done.
into a zipper pull. Just slide it through the tab on the slider and you have a new zipper pull.