Affordable dental care?

I asked this question before and the answers I got were not helpful at all. If I really can't afford to get regular dental care, then I definitely can't afford to go to Mexico. There are no dental schools in my area so, that is out. Unfortunately, my insurance has no dental plan and I need some work done. I'm starting to feel pain in my back tooth. Can anyone give me a helpful answer and tell me where I can get good, affordable dental care? Keep in mind I am on a very low income and, most insurance companies won't accept me.
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i hope everything works out ok
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