Hi James
You can see if this helps you -
http://free-medical-and-dental-clinics-in-texas.starshine1.aidpage.com/
And if you need any other information you can check my blog at
http://starshine1.aidpage.com/
There is a lot of programs you could try for to see if they can help and call 211 for information.
Call around to dental clinics and see if there is a Univeristy near by to get a consultation about your teeth
See what the local dentist have and the flyers sent out sometimes free consultation or dollars off first visit at least you will know what you are up against...
good luck but best to get it checked out and see about payment plans.
Starshine