Hi mattrom, I forget sometimes who's not fro UK and you may not know British refs.
You are almost thee with the parse but part of it plays double duty running into a secondary cryptic Def. And a little misdirection using 'set' as set of teeth and the set where TV Shows are flimed.
Pretty = def
One = tooth
(or more) = some
from the set (set of teeth)
and usually seen on the Jeremy Kyle show are people with only one tooth showing or just a few (some teeth) - which is a running joke in Uk.
I think that the people who have watched it will chuckle at this but anyone who hasn't may think it's crap.
It's worth a viewing on You Tube. I'll stick my neck out and say that whichever episode you pick on You Tube, there'll be a person with remarkably bad or missing teeth. Ha ha!
Have a great day to you all.