A teak deck
that is "screwed in" will have teak
plugs glued over the tops of the screws. They look like little round wood circles. Do not buy a boat with this if you have a choice as each hole is a potential leak point. Having said that, until epoxy
systems had advanced to the necessary level about 15 years ago ALL teak decks were installed in this fashion.
If the boat is manufactured in the last 10 years or so this should
not be a problem.