Toothless peeled his lips away from his teeth-- er, gums --and made a valiant attempt at the human expression of smiling. All in all it was a comical show, but hopefully the point was made. He inclined his head toward Haku, still "smiling", and then let his lips sink back into their usual place. It was uncomfortable to keep doing that for very long, he wasn't sure how humans did it. Nice to meet you, Haku. I'm Toothless.