Does a regular dentist DDS need a special license to perform a root canal?

I had a root canal done by a dentist (which I believe I really didn't need because of very min bone lost). Anyhow, now I have to go to a Endodontics to have it look at and pay over $800.00 out of pocket cost because my insurance already paid once for the root canal on that tooth. I am also getting two different stories.. The Endo tells me the dentist should never perform root canal and the dentist tells me I could if I needed to. Someone isn't telling on line pharmacies me the truth and I am in pain dealing with it.