<human>:  How do I fix a broken zipper on my suitcase?
<bot>: 
1. First, you will want to determine what type of zipper your suitcase has. Different zippers require different methods for repair.
2. If the zipper doesn't seem to be working properly due to a build-up of dirt or sand, try brushing it with a toothbrush to remove the particles.
3. Once you've freed the zipper from the obstruction, you should use a lubricant to reduce the amount of friction on the zipper. Petroleum jelly or a specialized zipper lubricant can work well.
4. Next, check the teeth of the zipper to see if any have come loose or broken off. If any teeth are missing, you will likely need to replace the entire zipper.
5. If the teeth are intact, you should carefully thread the zipper slider back onto the zipper. Be sure to line up the teeth properly and press firmly until it is secure.
6. Lastly, test the zipper to make sure it is functioning correctly. If it is still stuck, you may need to repeat the steps 5-6 times until the zipper slides freely.