Yes, jaws count as joints. However, just because you have trouble with your jaw, it does not necessarily mean that you have an inflammatory joint problem. Do you have problems with any other joints? Also, even people who do have joint problems do not necessarily get affected by the nightshade foods. If you suspect that you are affected by them, you need to do a test to find out. You’d have to remove all of them from your diet for a period of time (I’d recommend 2-3 weeks), and see how you feel, then add them back in and note any changes.

So, don’t assume you can’t enjoy them. There’s still hope!

TMJ problems can be helped by a skilled chiropractor; have you looked into that?