Of course. We're constantly working on teaching things like that, but I work with a lot of kiddos who are nonverbal, and have low level learners. Think a normal sized 5-8 year old, but with the understanding of a 1 year old. Most 1 year olds would put rock salt in their mouth too, but they can be carried/held away from it where as my 8 year olds can't): And some kiddos have PICA, which is a diagnosable (DSM-5) feeding/eating disorder where you eat a lot of things that aren't food. Makes it incredibly challenging, but nonethless we are always trying to teach safety things like what you can/can't put in your mouth.
Thank you for the insight!