If you're unlucky, you might have actually dislocated one of your TMJ's. Probably would be worth calling your dentist - if he/she has a Panorex unit (a device that swings around your head and does a flattened x-ray projection of your entire jaw), this could be determined. Don't know whether you would have to see an oral surgeon to have it treated. I've done films of these before, though I really don't ever hear about the follow-up.

[Edited to add: If you can't get a panorex done by your dentist, many hospital radiology departments have them. Could get it done with an order from your primary care doc, or in a pinch, through the ER.]

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Over 4.5 years bike crash free.