Hair has its own growth cycle, which is divided into anagen, regression and resting phases. The hair we see with the naked eye is the hair in the anagen phase. Hair removal creams use chemicals to dissolve the hair structure and make the hair in the anagen phase fall off. These chemicals are mainly composed of mercaptoacetic acid (calcium), which does not damage the hair follicle, so the effect of hair removal will not last long, and the hair will grow back in about 7 days. Some people will stimulate hair growth faster and more vigorous after using hair removal cream, moreover, these chemical ingredients have stimulation to the skin, frequent use will easily cause sensitive skin redness and allergy. So people with allergies should use it more carefully. Before using hair removal cream, you should do a patch test first. That is, a small amount of hair removal cream, applied to the inner side of the forearm, wrapped with a band-aid, 48 hours to take off, to see whether the local skin rash, if there is a rash can not be used. People who have a love for beauty and need to remove hair are recommended to use laser hair removal. Laser can destroy the hair follicles and is a very good method for permanent hair removal. Since the hair follicles have a growth cycle, laser hair removal is not done in one session, it is done about once every three months and takes 2 to 3 sessions.