What is a common poison that is an enzyme inhibitor and how does it interfere with enzyme function?

Here is a hint.
The most common: Stannous fluoride, in toothpaste. Your instructor probably doesn't want that, so research either arsenic or selenium, but neither of these is very common anymore. So, explore heavy metals (mercury, lead, .... including iron).
When one says common, that word can have many meanings.

is pluto a planet

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