Zipper that doesn’t move.

A zipper can get stuck for various reasons, but a simple trick that usually helps is to apply a small amount of Vaseline or lip balm between the zipper teeth.

This should be sufficient to fix a jammed hinge.
Teeth that have come out.

You will require adhesive, a cotton bud, and cutting tools. Cut the plastic stick of the cotton swab into tiny pieces.

Take a piece, make a small cut on one side, and place it where the tooth is missing.