How To Fix An Uneven Zipper Tall Boot's Zipper=Uneven. Desperate For Help?

Tall Boot's Zipper=Uneven. Desperate for help? - how to fix an uneven zipper

Yesterday, when I have a class that rode in my backyard. I told my brother, as felt "much higher." Oh, and I feel that the closure was not compressed, like a hole or something. Well, I zipped a short time to make a reality, you know, and they were very good. But the ground is irregular, a small hole, and it's like a domino effect, when a few teeth are not connected to the rest disappear.
How can I replace it and solve this problem without affecting the boot?
I could always replace the zipper ... but ... If I fix it why waste money?

Thank you very much. xx