The modern method of having braces installed differs entirely from the traditional way. Though the fixing is not painful, after the procedure you will feel some pinch due to the new pressure on your teeth and having new elements in the mouth. Due to the introduction of the new elements in the mouth, it will take some time for the lips and gum to adjust which means that you could end up feeling some pain. After a couple of weeks, the pain should subside. If this is not the case, you should inform your dentist.