Step 1:
Check how many elements, prongs, or teeth are missing on the zipper.
Step 2:
Using long nose pliers, carefully remove elements (as much as you need) on the top part of the zipper and the top stop as well.
Step 3:
Get a toothpick and carefully insert the elements one by one. This will open them up.
Step 4:
Using your pliers, get the elements and place them on the edge of the tape where there are missing pieces. Adjust the spaces using the toothpick.
Step 5:
Use a hairdryer to heat it and close the elements.
tep 6:
On the top part of your zipper, cut off the excess tape, then sew the end element using a thread and needle. Use a lighter to light burn the edges of your tape and you are done.