Huh, are there speciality chewing sticks purpose made for this?
Raw mastic gum seems to be gaining popularity in the US.
Neither is popular for the explicit purpose of cognitive enhancement, though.
that is for cleaning the teeth, and I read somewhere that there is some evident that it is somewhat effective in reducing tooth decay.
https://en.m.wikipedia.org/wiki/Miswak
in India there was or is a toothpaste brand called Meswak, which includes miswak as an ingredient.
nice wordplay in your username :)
evidence, voice typing error.
Licorice sticks might be used too.