GTG3000

For a moment I thought this was ProgrammingHumour and a funny response to calling someone’s code undocumented.

Then I read the full post.

Tooth enamel is ~5 on mohs scale. Quartz, the most common kinda rock (afaik), is ~7. You’re correct that enamel is harder than steel though, since it’s ~4? Disclaimer: all of these numbers are from a quick google search.

Fun fact, this is why we know ancient people used to make bread - the way they separated wheat from the chuff included dropping it on the ground, which led to sand being in the bread and consequently destroying their teeth over a lifetime of eating it.

It’s not a “no one asked you”, but it is an idiom. As you can probably guess, it means more “don’t help people working against your interests”.

So, you’d say something like that to a pro-ICE minority person, for example.

Well, rocks in toothpaste would be very bad because they’d be harder than your teeth.