Demons Out

When a priest exorcises a demon from someone, where does the demon go?
Does it go back to Hell? Or does it get released into the wild so it can possess someone else?
And if the demon goes back to Hell, what’s to stop it from finding its way back here to possess someone else?
Can daemons be destroyed? Because I’d think that would be a smarter option than just prying them loose and letting them go bother someone else.
Unless you’re in the business of exorcism, that is.
Can’t go threatening your customer base and revenue stream, I guess.