<human>:  How can I repair a broken zipper?
<bot>: First, determine the cause of the broken zipper. If the slider is the problem, you can replace the slider with a new one of the same size. If the zipper teeth are damaged, you can attempt to realign them using tweezers or a similar tool. If the separation of the teeth is too wide to repair, you have to cut the zipper and replace it with a similar one of the same size.