My root canal has the infamous gutta percha filling in it (which i've heard can easily get contaminated and host bacteria) and the top is a porcelain onlay. Well i hope none of these substances have been mixed with mercury. A cofferdam was used in all of the procedures, everything should have been sterile, but who knows. At least i don't feel any pressure pressing on the tooth now, unlike before.
Finding a truly caring, educated and wealth-practicing holistic dentist in my country is impossible i would say. Everyone here is money-driven, unfortunately.
I looked up the dental meridian charts, i think they are just too generalised and can't be taken entirely seriously. I'm sure they can point you to something, but it might not be necessarily the holy truth for everyone. It's like the Acne map charts, just pointers, not something that definitely fits everyone's situation and symptoms.