Does a sew-in damage your hair?

It is important to cleanse, dry & moisturize your natural hair/scalp while wearing a sew in. Yes, you should use a hooded dryer after washing your sew-in/hair. You can opt for a sew in with an invisible part and/or closure & ask your stylist to leave no natural hair exposed. While wearing the sew-in it may be easier for you to opt for washing once a week and skipping your rinse, unless you don't mind spending the extra time under the dryer.