I have worked in the Pharmacuetical industry for 12 years and Panadiene is ok to take for short term, honestly the stress and pain you are in would prop affect bub more than a few panadiene. I would not take anything in first Trimester though. as long as everything with your pregnancy if fine I would'nt worry too much. Try to alternate Paracetamol with the Panadiene (To limit the amount of codiene).
You could try cold packs on your jaw too
Just check the packet of what your taking, there's alot of brands out there now and it's easy to get confused. As the others said, don't take any asprin, nurofen. I would always buy any medication from a pharmacy and ask for proffessional advice. It scares me that they sell this stuff in supermarkets now!:mad:
Hope you feel better soon, all the best