A laser specialist will be able to tell if all the facial hairs will be removed with just one laser setting. And in most cases laser surgery / therapy can provide a permanent solution , but your hair can come back , at this risk you need to be treated. Many times after laser treatment the skin has to take much more care. Usually if there is no problem then as a side effect - you may get scars on your face , there may be infection , the part where laser therapy has been given may change color , sometimes even a small burn. It is also possible that you have completed the treatment safely without any problems. However, these risks must be kept in mind when taking laser therapy.