There are a number of reasons for this: The hair is not at least 3-5mm long The area is not clean and free from makeup (Facial wax) and moisturisers The area has not been allowed to dry after using Cleansing Wipes, or after a shower or bathing (wait at least 1 hour to allow the moisture level in the skin to return to normal) The strip has not rbeen emoved in the opposite direction of hair growth, or is removed in an upward direction rather than close to and parallel with the skin The skin was not held taut when the strip was removed.