Where can i capture dental insurance important date and termination date from?

ok here is my problem. i have to show proof that i had 12 months preivous insurance or they wont pay cheque for my dental work. i really want this asap and i dont know how to . aetna the dental insurance company says it can be anywhere from 7 to 10 days or even longer for them to give me what i necessitate. and i called my ex employer and she said she can not give me any brand of statement like that. what am i suppose to do? please someone please help me.
Answers:
to be precise the only two places that I know of

Can the dental office or other insurance company not phone call and find out? Or can you get your previous employer to give you something next to your dates of employment listed on it and the reality that you had benefits when you worked there?


Related Questions:
Absolute best Dental insurance?   Help! I enjoy a broken tooth and i cant afford dental insurance right immediately. What can i do?   Do you recieve dental services while within drug rehab, if it's state funded insurance?   Do you own medical. persc. drug coverage and dental insurance?   How much should a dental crown cost in need insurance?