You may experience some discomfort during your orthodontic treatment. For most people, this discomfort is minimal and manageable with over the counter pain killers, ice to reduce swelling, and orthodontic wax to reduce friction from the braces on the inside of the mouth.
You are most likely to experience discomfort when you first get your braces, and also during and directly after adjustment appointments. Once you get used to wearing braces, pain and discomfort will decrease, and you may even forget you're wearing them.