What you will need:
- clothing with broken zip (only works for METAL zips unfortunately, make sure all teeth are still in place)
- candle stick
Take the candle (here I just used a simple non-scented candle) and rub it against the teeth of the zip. This will help lubricate the zip and encourage it to come together. Keep rubbing it and attempting to re-zip it up together. Note that this may take a while, it took me a good 5-10 minutes.