What do you suggest if i had nerve damage at a dentist 10 years ago. last march, i herb or supplement that would help with radiation spill-over and this kind of facial pain?

Herb\supplements: For nerve damage, I would not expect any herb or supplement to do anything. Not knowing the "kind of facial pain" or which "herb\supplement" was mentioned, although doubtful and not a big proponent of herbs or supplements in general, I can not answer the question.

See OFP specialist: Neuropathic pain is one of the most challenging and complex pain conditions. It is generally defined as “pain due to a primary lesion of the peripheral or central nervous system (or both).” Current state of the art dictates that all patients should be treated initially with medication. Herb/supplements won't help, but can be used as an adjunctive. See orofacial pain specialist for evaluation.