IF 'I' was trying to figure out whether my dentist was telling the truth -- that is if my root canals were filled or not filled with Amalgam -- I would ask for and actually VIEW my own set of X-rays. By viewing X-rays it is EASY to tell if the patient has had any root canals with apioectomies.
I see no reason why you should question him/her too much. Simply ask for and actually VIEW your own set of X-rays. By viewing your X-rays it will be EASY to tell if you have had any root canals with apioectomies.
The lack of apioectomies mean there is no Amalgam in or about your root canals.