Using these clip - in hair extensions is easy. Just clip them into your natural hair where you want to add length or volume. When it comes to care, use a sulfate - free shampoo to keep the hair clean without harsh chemicals. After that, use a detangling conditioner and start combing from the ends to avoid breakage. Deep - condition the hair once a month to keep it soft and healthy. When sleeping, use a silk scarf, bonnet or a satin pillowcase to prevent the hair from drying out. Take care of your scalp as well. Avoid overusing hot tools, and always apply heat protectants before using them. Be gentle when brushing and styling to make the hair last longer and prevent breakage.