Scammed or not

General dentist said I had infection in my root. She sent 2d exrays to endonontist. Endodontist did not take any xrays and said I had 4 infected teeth.

He did the work and charged outrageous money. I took my xrays to another endodontist who said the proper procedure would have been for the endodontist to take a 3d xray because the 2d xray did not show the other 3 infections. I believe I was scammed. What should i do?