Symptoms
- Zipper splits open at one spot every time
- Visible gap in the teeth
- Slider passes over the gap instead of joining it
- Fabric bunches at the missing section
Likely causes
- CommonTeeth worn or sheared off from repeated stressHigh-stress spots like pocket corners wear out first.
- CommonTeeth pulled out by snagging on somethingA caught tooth can rip free of the fabric tape.
- Less commonMelted or damaged teeth from heatIroning or a dryer can melt plastic zipper teeth.
What to do
- Confirm the gap is missing teeth, not just fabric caught in the slider.
- For a small gap near the top, you can sometimes sew a bar-tack stitch just above the missing teeth to act as a new stop, sacrificing a little length of zipper.
- For plastic coil zippers, a jeweler can sometimes re-crimp a displaced coil tooth back into place.
- For a full replacement, remove the old zipper by unpicking the stitching along both tapes.
- Measure the length and note the tooth size (usually printed on the slider) before buying a replacement.
- Sew in the new zipper following the original stitch lines, or take it to a tailor if the item is structured (jacket, bag).
Tools and parts
- Seam ripper
- Sewing machine or needle and thread
Replacement zipperSearch: “matching length and tooth size replacement zipper”
When to call a pro
For leather jackets, suitcases, or tents, a tailor or luggage repair shop will get a cleaner result than a DIY sew-in.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.