A. Usually 2 crowns that are joined together is called a bridge. Tis is done when a false tooth replaces a gap in the mouth. I am unsure of your case as I haven’t seen you in person, but I would strongly advise that you see your dentsit and discuss any concerns that you may have. Having seperate crowns is the best way- as cleaning and flossing around it is much better and that way may help prevent food packing and gum disease.