This is a great question! First of all, TMJ is often overlooked. TMJ is the joint in the jaw that opens and closes the jaw. And unfortunately, people think, "I have TMJ, and it's not the joint, it's more of a problem between the muscles and the teeth and there's a mismatch between the two." and when the teeth are in the wrong position, the muscles start to contract and people end up with headaches and jaw pain. By using Invisalign, or any other corrective movement appliance including braces, we can move the teeth in a predictable way to maintain the perfect balance between the teeth and the muscle.