The right side of my jaw keeps hurting ever since i started wearing rubber bands for my braces. what can cause this?

Teeth or jaw joint: It may be just the teeth are sore, in which case touching the teeth will show they are sore. It may also be your jaw joint or muscles. Tooth pain is nothing unexpected. Jaw problems are a different situation. You need to bring this to the attention of your doctor and if it is the joint you will need to find the best position for the jaw/joint and treat to that relationship.