It is unfortunate that you are unable to find a venue for your needed professional dental care. Since the implied problem is your financial constraints, your best first step would be to seek out third-party health financing programs, because dental practices do not as a rule offer financing on their own. Perhaps the best known of these programs is CareCredit, which has relatively lenient credit rating requirements. I would commend you to their web site to investigate whether you qualify: http://www.carecredit.com/
If you fall below the poverty level and do not have sufficient credit to qualify for financing, consider investigating some of the sources of reduced fee dental care:
--If you are disabled, you may qualify for your state's Donated Dental Services program. In some states, overt disability may not be required to qualify, so it may be worthwhile to contact your local chapter to inquire. You can find contact information for your state DDS program here: http://www.nfdh.org/donated-dental-services-dds/state-dds-programs
--If you fall below the poverty level, you should consider applying for Medicaid. Admittedly, some state Medicaid dental programs have been largely gutted, and provide only the most basic care, but they should be able to assess and treat your infection, which is a priority. See: https://www.cms.gov/home/medicaid.asp
--Dental service is available at dental school clinics at fees that are substantially below those at private practices. See: http://www.ada.org/267.aspx
--You can seek dental care in a community-based federally subsidized clinic; to find one near you, see: http://findahealthcenter.hrsa.gov/Search_HCC.aspx; see also: http://www.freemedicalcamps.com/
--Several charitable programs provide free dental clinics around the country. Contact: Dentistry From the Heart or Oral Health America.
--You may also contact your local component of the American Dental Association for more community-based guidance for sources of dental care. See: http://www.ada.org/localorganizations.aspx
Hope this helps...