[TXnMA]

On the question of mg vs µg, perhaps we should keep in mind that the sources of these tartar samples never went in for periodic teeth cleanings -- or, even, had toothbrushes, etc.

A dentist friend of mine who goes to underdeveloped countries on summer missions trips, says that he is astounded at the big chunks of tartar he pries off of patients' teeth -- even young adults'...

[SunkenCiv]

:’)