I was at the dentist recently for a toothache. He snapped some X-rays, gave my mouth a quick lookover, said I appeared to have cracked the tooth (likely from my severe TMJ) and would need a root canal. He forwarded me to an endodontist. The endodontist discovered I had a strange mass in my jaw that appeared unrelated to the cracked tooth. He put me on antibiotics to prevent infection and forwarded me to an oral surgeon, who confirmed the mass was harmless. Now I’m going back to the endodontist for the root canal, and then back to the dentist for the crown. I have spent over $500 and about eight hours in dental chairs to get this far. It will be thousands more dollars and dozens more hours before I solve this problem. None of it is covered by medical insurance.
Source: The Reason Your Dental Work Isn’t Covered by Medical Insurance / NBC News