The state aid programs vary. ADA provides contact information for national associations.
US Department of Health and Human Services Health Resources and Services Authority.
Your state's public health agency's oral health program.
Dental school clinic. In general, dental fees at school clinics will be reduced and may cover only part of the cost of professional services, including materials and equipment. Your State Dental Association can tell you if there is a dental clinic in your area. The ADA provides a link to the State Dental Association to determine the location of the dental clinic. They also provide a list of dental schools.
County hospitals usually have an emergency dental plan.