Had braces- perm and removable retainers. have extremely strong clench. pushed bottom front teeth down into my gums. swelling major pain since thurs?

What to do: The symptoms you describe could be from any number of causes. In order to diagnose the problem and treat the cause, you need to see a dentist as soon as possible. In the meantime take some OTC pain medication- Advil, Motrin, Aleve or what you would normally take for a headache. Rinse out with some salt water and stick to soft foods. Feel better soon.