Just found out about 医療費控除. I lost the receipts from a few years ago and my dentist will not reissue the receipts

Unfortunately I no longer have the receipts. From what I understand, I don’t send the receipts with the application for the dedication, but may be asked for them later. My dentist office said they won’t reissue the receipts. Is there any other way to prove that I received and paid for the treatment?

by Nervous_Ulysses