Since you have just started Invisalign, what you are feeling is more likely a repositioning of the jaw. This occurs because the aligners that you are wearing don't allow te teeth to touch.
Normally, the teeth will guide the jaw into position, but with the aligners in place, the jaw is free to into any position that it wants to. If you have never experienced any sort of jaw or facial pain, such as TMJ, TMD, or MPD, then you probably have nothing to be concerned about. I would, however, keep my dentist/orthodontist informed of this.





