Please do stop worrying about your dentures! I have my own teeth DH has a partial upper plate and a full lower plate and I can honestly say it has not made any difference.
At first, last year when he first got them, he was naturally a little self-concious, but it honestly makes no difference to me whether he has them in or out of his mouth when we are kissing.
If anyone is so superficial that your dentures worry him, then I would take it as a good indication that you might enjoy his company as a friend, but not as anything more than that.
If you like him, you could ask him what he meant by calling himself superficial. To me it sounds as if he is deliberately putting himself down - perhaps a comment from an ex?