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3.when you dye the hair with bleach powder, please control the time within 5 minutes. if you dye it with dye cream, you need to control the time within 4.when sleeping,please bond the hair with elastic band or wear a cap. it will avoid tangling or shapes-changing. after waking up, please remove the band and comb through we suggest to wear a swimming cap. because the sea water or pool water 20 minutes. otherwise, the hair will be damaged by cream if you leave it too long there. beginning at the ends and working your.syi