As MB recommended, I think you have to pull out the entire hair. I was not patient enough and plucked hair with a pair of tweezers, ususally breaking 1/2 of double knots at the base. It looked ok for a while but after a few days, the other half of broken double knots unraveled and started to fall out. Not the density is too thin, with some bald spots. I had to send it to Debbie to get hair added.