Your teeth may be sensitive during 2 or 3 days following each appointment, especially at the beginning of treatment. This is unfortunately a normal consequence and it is suggested that you have a softer diet during that time. If the pain is too intense you may take an analgesic such as Tylenol, Advil, etc.
There is no reason to be concerned during your orthodontic treatment. If something seems strange to you, do not hesitate to call. We will be happy to answer any questions or solve any problems you may have.