I believe dismiss clears out your notification queue thingy (I’m stating it like this so you use the appropriate amount of caution ;P). From that modal, which I’ve never seen, it appears to have a k-rad option to also shut down future notifications by resetting the tracking status.
Whatcha gonna do? 
- Click Dismiss!
- Don’t Dismiss!
- Oh, I haven’t voted in a pie poll yet!
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