Just one! Do not wash or wet your lashes for 48 hours after receiving the treatment. The product requires 48 hours to reach its maximum lifting potential. During the 48 hour period please avoid the use of eye makeup, saunas, swimming, steam rooms, cutting onions, tears etc. Moisture to the lashes will weaken the YUMI™ product. Day to day care of your YUMI™ Lash Lift is easy! Feel free to wash your face and lashes as usual after the 48 hours are up!