I am diabetic and I found out in Jan 2011 that I have a tooth abscess.  I havebeen to five different dentists, but no one has been able to help me.  So, being diabetic can this be a cause for a tooth abscess and considered a medical health issue rather than just dental?
Thanks for your query, I have gone through your query. The abscess could be because of the tooth infection or gum infection. Yes, you are right, the diabetes increases the risk of abscess formation in the oral cavity(multiple periodontal abscess). Consult an oral physician to rule out these conditions by taking a radiograph. If it is gum or tooth infection You can take a course of antibiotics and analgesics like amoxicillin 500 mg and metronidazole 400 mg TID for 5 days(if you are not allergic).  After taking antibiotics you can get the tooth treated with RCT(if bone support is fine) for tooth infection. If it is gum infection then get your teeth cleaned once and maintain the oral hygiene. If needed grafts can be placed to make the tooth firm. I hope my answer will help you, take care.