Though you may not think it, internal doors offer a warm welcome into any room of your house. Before you even catch a glimpse of the room hiding behind it, many of us, if we have never been into a particular building before, will always judge the room behind a closed door on the door itself. After all, would you enter a room with a knife sticking out of the door? Visions of Halloween aside, doors provide a safe entry into any room of your house, and just like any piece of wooden furniture, doors need looking after too.