Hall of Infinite Doors

At this point having seen every type of portal or door imaginable you think you are ready for anything. You were wrong. What approaches next in the hallway is both frightening and outlandish. A large dragons head emerges from one of the walls. It is a green head covered in scales sporting a maw that would cause the bravest of nights to run away in fear. It turns out that these dragon's facial features are actually doorways to other worlds. Shall you enter the dragons head or continue onward?