1. Don't pull too fast, too hard, and don't pull hard.
2. Do not pull it too tight to avoid stretching.
3. Often apply a layer of wax to the zipper and pull it back and forth to make sure it is smooth.
4. Be sure to close the zipper when washing clothes, otherwise the zipper will be washed and twisted by the washing machine and dryer, resulting in the zipper teeth falling off and damage.
5. Often check the zipper, pay attention to whether there are "teeth", "skew" and other phenomena, such as loose can be used a small hammer in the zipper head gently a few times, so that the upper and lower teeth bite a little tension, the teeth will not often fall off.
