After achieving your dream result, monthly follow-up treatments are recommended, with a gradual tapering off to every 2-3 months. month as needed. Hormones and genetics affect hair growth, and in ones twenties, more treatments may be necessary due to hormonal changes. Age and more stable hormones can increase the durability of permanent hair removal. In addition, hormonal factors such as pregnancy, menstruation, PCOS and birth control pills can also affect the need for follow-up treatments.