Unlike the human hair,the synthetic hair fiber may get tangled after 2-3 wears because the synthetic clothes that build up static,especilly in winter.To prevent it,kindly you can get a spray bottle and put some conditioner in it, then fill it up with water. Spray it in the hair extensions.It will make the hair extensions not very dry and prevent getting tangled in some extent. Yes,you can.The hair extensions is the heat-friendly hair fiber so you can restyled it with the scissors or curling iron.It will be better to wet the hair extensions before you curl the hair which will make you curl the hair more easily.However,do not like the real hair,it's not easy to make a big curly the same as it before.The hair extensions factory is using the special equipment to make a big curly.