With the DC Hair App you have an extra indent. Save for advantage and use special offers for our loyalty cardholders. If you do not have a card yet, you can request one with this App by completing the registration. If you do have a card, and you want to link that card to this App, then use the same e-mail address that you provided when you received the card (this is the e-mail address from time to time) receive us). With the DC Hair App your advantage starts immediately.