T.F.
I've been in the Dallas area over 20 years and I have never heard of anything like that.
There are so many regulations, state laws, certifications, license, and more that must be adhered to in order to be accredited.........I don't believe a dentist would have the time to offer private schooling if he/she wanted to actually practice dentistry.
I also think it would be against the state laws for a dentist to privately tutor a student and even if it was ok with the state....the money required for private tutoring would be woefully more expensive than $3000-$5000 which is nothing compared to paying a semester of college tuition.
Check with Quad C (Collin County Community College).. they are known to be a good community college. I've heard is it economical and a lot of students go there when they can't afford a larger university. I can't imagine tuition being less than $3000 a semester though.
Check with the financial aid offices at accredited dental schools and see what you can find out from that perspective.
Also ask your dental provider for guidance on the schools in our area (there are MANY) which are the best and more respected than others. When looking for a job.... it does matter where a degree was earned, plus you get bonuses based on the better schools for better training, etc.
Good luck to you.