While you’re waiting for other members who have taken Evenity to respond, I can give my 2 cents worth as a 30+ year certified dental assistant. Minor joint or bone pain is listed as a possible effect of Evenity. But what you’re describing doesn’t sound like the type of pain associated with the warnings printed on the box for osteonecrosis. That is very rare and associated with surgical procedures or infections.

It’s encouraging that the Tylenol took the pain away. There can be any number of reasons for the symptoms you’re describing from sleeping in an odd position with your jaw clenched, sinus pressure, a fracture developing in a molar, etc.. This may just go away on its own. But certainly if the pain continues more than a few days or gets worse, then give your dentist a call. They can take an xray of the area to rule out any tooth or bone issue.

I found a good article for you on Evenity and the possible side effects.
https://www.medicalnewstoday.com/articles/drugs-evenity-side-effects
If you haven’t already, you might want to check in this discussion with other members about their experince with Evenity.

This discussion was started by @arlene7 https://connect.mayoclinic.org/discussion/evenity-osteoporosis/

I hope you’ll let me know how you’re doing. Fingers cross this subsides on its own. 😉