Question about DS Flashcarts.

I'm planning on buying a CycloDS Evolution sometime in the near future.One thing I wanted to know, is once you remove the Flashcart from your DS, will it go back to being a normal DS? The flashcart itself doesn't modify the DS in anyway like a PSP custom firmware does, right?Cause I'm thinking of probably getting one for my mother too, but I don't want to permanently change her DS.

a flashcard does not permanently change the DS

No it doesn't, there's practically no way for it to access the DS firmware etc. "safely" anyway. So, yes, they don't modify or change the actual DS in any way. Unless you get some shit cart.