December 11th I got temporary crowns done to my upper teeth, which are still in. Ever since then my lower row of teeth/gums have been hurting and I've been needing to take ibuprofen at night to sleep.

The teeth that got worked on feel entirely fine so I'm wondering why nearly all of my lower teeth/gums hurt out of nowhere when they weren't worked on. It doesn't hurt 24/7, it seems to flare up out of nowhere, and if I wait long enough, goes away on its own for the rest of the day. What could it be?