It could be caused by dry hair. Please make sure to wash & condition your hair at least once a week, twice a week is better. Brazilian virgin hair Comb the hair from time to time. You could go to your stylist for further suggestions. If the hair is wavy or curly style, we don't suggest to comb it. If you have to, please comb it with hands or wide-teeth brush gently. Tight teeth brush will ruin the hair original shape and make it fizzy and feels like tangle! Please always comb the hair from the ends and work your way up. 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 20 minutes. Otherwise, the hair will be damaged by cream if you leave it too long there, which will lead to shedding. 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 beginning at the ends and working your way up to the roots. When swimming, we suggest to wear a swimming cap. Because the sea water or pool water is not good for hair, it will make the hair tangle and rough. It`s better to wash it with warm water, with hair shampoo and hair conditioner after swimming.