Try putting a bit of vasaline on the zipper teeth and gently pulling the zipper pull with a pair of needle nosed pliers.
You might see if you've gone below the sewn part of the base of the zipper….in that case it might just be better to take it into one of those quick tailoring places and have them replace the zipper for you. References :
You can also try rubbing a candle on it. The wax will let the zipper glide more easily. Then try working the zipper in either direction with a pair of pliers until it loosens. Try working it gently and make sure no fabric is caught in the zipper. References :
May 27th, 2009 | 
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Try putting a bit of vasaline on the zipper teeth and gently pulling the zipper pull with a pair of needle nosed pliers.
You might see if you've gone below the sewn part of the base of the zipper….in that case it might just be better to take it into one of those quick tailoring places and have them replace the zipper for you.
References :
You can also try rubbing a candle on it. The wax will let the zipper glide more easily. Then try working the zipper in either direction with a pair of pliers until it loosens. Try working it gently and make sure no fabric is caught in the zipper.
References :
try talcum powder or rub dry bath soap along the teeth.
References :
Rub a bar of Zest Soap onto the Zip and up all the teeth.
Or you and rub pencile led onto the teeth and zip.
References :