Been thru the process and you have to build a case that the work on your teeth was medically necessary. Seems obvious but you have to prove it. I put together file of letters from dentist, and rest of my medical team and sent letter to insurance company. Followed up with phone calls and additional update letters. Was turned down once as there dentist said this was cosmetic process. That was the mistake - stupid! After one year was reimbursed 100% for all the work. Don't give up, get the letters and follow up. Good luck.