Contact Baylor Hospital and find out if they have a oral surgery division which does free and reduced work.  Sometimes hospitals have scholorships based on income that you can apply for.  Let the People at Baylor know your situation.  If all else fails, check into the NIDCR (National INstitute of Dental and Craniofacial Research) clinical trials at the NIH (National INstitutes of Health) www.nih.gov in Bethesda, MD.  FInd out if they are doing any studies.  They are always looking for volunteers.  It is quite possible that you could volunteer for a study, they might be able to provide transportation if you meet the study requirements.  Best of luck.