It means they are there and might come through and will probably cause problems. Whip them out now. Seriously. They are not toxic or 'dangerous' now and maybe they won't be for a year, maybe 10 years, maybe 20 years but they WILL be a problem so deal with it now.
TALK about this with your dentist. It's YOUR mouth so take charge and discuss your options/concerns/questions.
I was told by my dentist 20yrs ago to have my wisdom teeth out but I was stubborn and said that while they were decay-free and not causing any bite problems then I wanted to keep them. Fine. Now they are beginning to cause problems (decay, bite, etc) and they will have to come out anyway. I wish I'd done it in the first place.