Peanut butter is sold in two forms:
"smooth/creamy/..." and "crunchy"
The crunchy is usually smooth peanut butter with some chunks of
peanut added back in.
That's only if you go for plastic peanut butter. The real stuff is
significantly coarser than "smooth" but does not have anything
approximating real crunch. I suppose you could add peanut pieces to
it, but I don't see the point, unless you like sharp corners doing
violence to your gums. ("How I envy the ro-o-o-ose you held in your
teeth, love / With the thorns underneath, love / Sticking into your
gums!")
It's not very abrasive.
True. Peanuts are rather low on hardness scales. :) For things
needing a bit of abrasion, slightly dampened baking soda can often do
good things. It's also comparatively nontoxic; even inhaled, it just
dissolves upon meeting mucous membranes.
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