The advantage of circumcision for teenagers is to reduce the probability of the incidence of glans phimosis, the disadvantage is that after the operation there may be pain, swelling and other symptoms, but it is only temporary and will not cause long-term harm. 1. Advantage: the presence of circumcision as well as phimosis in adolescents may repeatedly induce glans phimosis, which can reduce the probability of the incidence of glans phimosis after the surgery. If the adolescent has severe prepuce, it will affect the development of penis, after the surgery, it can avoid the development of penis too small. 2. The bad side: after the surgery, due to the existence of surgical incision, it will cause pain and swelling symptoms, and in the postoperative care is not appropriate, it is also easy to make the wound site infected, which will bring a certain degree of pain to the teenager, but only for a short period of time, and generally will not cause long-term harm. Surgery is not recommended for adolescents who do not have a phimosis or circumcision, and circumcision is only recommended for adolescents who have a phimosis or circumcision.