Most dentists have payment plans available. Some state Medicaid programs offer dental coverage to eligible people as well. You can also try contacting the nearest dental school to your home and seeing if there are any free or low cost clinics nearby. These clinics are staffed by dental students learning the trade.
You could call your local social services and ask. Sometimes collages that are training students in dentistry will take the public and you will get deep discounts on their services.
You can search in internet for the dentist that you want there is a lot of webs to search it,for example: google, yahoo, altavista, ask, now in internet you can find all that you want