Investigating the functional effects of dentifrices (for example, the inhibition of acidogenesis or proteolysis) at sub-lethal concentrations is normally achieved (for acidogenesis inhibition) by exposing oral bacteria to diluted formulations and assessing changes in pH with a microelectrode, or by the chemical analyses of fermentation acids.

a poetry reading.

There's nothing to do here. It's all crapoid.

It has produced superstitious enthusiasts, harebrained vagarians, who have brought the most sacred things into contempt.