It is okay for a fifteen year old girl to wash her hair if she has to have her period, but she should keep warm and avoid getting cold. Fifteen-year-old girls can wash their hair when they have their period. Pay attention to the temperature of the water when washing hair, use warm water to wash. The temperature of the room should be suitable when you wash your hair, and after washing your hair, you should dry the water in time and use a hair dryer to dry your hair, so as to prevent cold and fever and other discomforts after getting cold. Fifteen-year-old girls need to pay attention to personal life when menstruating, washing hair and taking a bath is still possible, but to prohibit tub baths, avoid strenuous exercise, do not stay up all night. To strengthen nutrition, ensure enough sleep, keep the vulva clean and dry, change underwear and sanitary products.