I totally sympathize. I have never had dental insurance, but my teeth have been my major health issue as an adult.
I had a molar pulled a few years back rather than get a rootcanal, it was the difference between $2000 and $80. The dentist was really upset at me for doing it, saying I would regret it and on and on. But I felt okay about it and just did it. Well, I really don't miss that tooth and I couldn't live with the pain, so c'est la vie!
So that is an option, depending on what tooth it is and how your partner feels about it. Most dentists won't even tell you you can get it pulled, but you can!
Also about the wisdom teeth... I would do some research. Often they are pulled without really needing to be, or you could wait a few years with no issue. I guess it all depends if you have pain or symptoms, at which point you probably want to do something, but if not, don't be pressured into doing it, when you might not need to.
I have been going to a holistic dentist for many years. I have gone to 3 different ones in different states. They have all been awesome at listening to me and giving sound advise, rather than just telling me what they are going to do.
I also have done payment plans when I couldn't pay. Like I paid $35 a month over a year when that was the only way I could pull it off.
Excellent dental hygiene and good nutrition are worth so much more than regular dental visits in my mind. And I prioritize taking care of myself and educating myself about dental health from a holistic viewpoint. The awesome thing is that information is free and available if you seek it out.
My advise would be to find a holistic dentist. Take care of the fillings on a payment plan and put the wisdom teeth on hold and find out options for the rootcanal, and research having the tooth pulled.
btw, root canals can harbor infections that leak into the whole system and can really mess with your immune system, making you have a low level infection at all times.
I have had this happen. It is hard to detect, but worth finding out more about. So if you can avoid root canals, do!
PEACE and Blessings!