I often find it difficult to work on someone else's dream. Usually because the descriptions are so short and leave out comments that only the dreamer would put in – and these often give vital clues.
So I think this is a subtle play on your husband responses to you and that he has false teeth. You see, the comment changes when you enter the room, then he is putting his false teeth in – whereas you were apparently talking to your child saying your husband has not teeth – in.
It could be a memory of seeing your father and his false teeth. Other than that I do not know. You could try finding out for yourself using http://dreamhawk.com/dream-encyclopedia/acting-on-your-dream/