Hi Russ,

Thanks for the pointer to Steinman. After a bit of searching I came across a paper of his:

Relationship of Fluid Transport Through the Dentin to the Incidence of Dental Caries

Something interesting mentioned in the paper was that injecting the rats with urea prevented tooth decay by increasing fluid flow. Fascinating. Unfortunately the urea places a load on the kidneys which wouldn't be too good for those with amalgam poisoning.