Your dentist will not change the braces, although many patients assume they will. Instead, he will tighten or adjust the main metal wire. Sometimes your orthodontist might decide that the main wire should be exchanged for a new one. In this case, you will feel pressure on your teeth for a few days. If you have braces for more than 3 months, the pain is not going to bother you, as your teeth have already gotten used to it.