I second the dental school suggestion. They're not all the same - some are very selective in who they accept and your dental problem has to match what the dental student at the time needs to practice on but others have clinics and will take in anybody and it's much cheaper than a private dentist...or insurance.
I used to know someone who was a student near San Antonio and their school used to be pretty open.
Even for citizens, access to dental care is pretty bad in this country. This is a good watch:
https://www.pbs.org/wgbh/frontline/f...-and-dentists/
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Mid-40's dreamer (yeah, time flies), aged out of original DACA and didn't have a chance to apply for extended DACA after Republicans killed it on the vine. Have family petition that is now officially current but with past skeletons, is risky to move forward with AOS. Life is on hold for now until laws and/or government becomes more friendly. Life kind of sucks at the moment but like Al Bundy and the mighty cockroach, I survive.