After chemotherapy, your eyelashes should gradually return to normal. Once this has happened, Latisse can help them continue to grow longer and thicker. There are approximately 100 to 150 eyelashes on each upper eyelid. The growth of eyelashes is cyclical, going through 3 stages: a growth phase, a transition phase, and a resting phase. Normally, at any given time, numerous hair follicles can be found in each of the different stages. Chemotherapy can throw many or all of them into the transition phase causing them to be lost. The growth phase of an average eyelash hair is approximately 1 to 2 months. Latisse has been shown to increase the amount of time each eyelash hair remains in the growing phase which will help them to grow back after chemotherapy. The application of Latisse has also been scientifically proven to increase the thickness of eyelash hair as well as the darkness of each hair which will help them look fuller as well.