"Dental care keeps him on the job" - NARA - 514788 (Photo credit: Wikipedia)
Children under the age 21 are covered for checkups and dental emergency's. Adults on the other hand may not be covered at all for dental care. It depends on what state you live in.
It is important for you to find out if you're covered or not by the state you live in. Do not wait until you have a toothache to get this information.
If your state does not provide dental care. You should look into dental insurance. I have seen policy's as low as $6 a month.
If you need dental care now and can't afford a dentist. Read this article to get temporary relief until you can see your dentist.
Emergency Relief Before Dental Appointment