You might try a local church for help (you may have to try a few- not all help like they are supposed to, but many, many do). I worked in the church office- substituting for a lady who was out for a few days- and was really surprised to find out how many people call for help with bills and stuff. They have to be checked out of course, because there are alot of scammers out there, but my guess would be that you would be able to find one to help in a situation like this, and who would make arrangements with a dentist for payment- or have a dentist in their church who would help you (and no, you don't have to attend their church to ask for help
). I hope your feeling better soon!