Where in San Diego county can an adult, blind, on SSI, no dental insurance, get free or low cost dental care?

I am in a lot of pain and need to see a dentist but I have no money to do so. I am over 21 and here in California the Medi-Cal or Medicaid for blind adults on SSI does not include any dental care? What can I do? What are my options? Does anyone know of a place for free or low cost dental care or the best dental insurance for a very low income blind adult individual who really needs a few root canals? I want to avoid extractions if possible. I want to avoid extractions because I don't want to be toothless in the front side area since I am no old yet and I want to preserve a sense of feeling that I look acceptable. Thank you.