I have a 7 month old yorkie and I just notice this past couple of days that two of his teeth came out. I found them on the floor.

But I see on the front teeth he is starting to get two rows of teeth. The new one have not fully come out yet . Is there still a chance that they can come loose on their own? Has anyome had this happen. I think the ones that fell that I saw are his molars? Is there any risk to him if they do stay? I know about food getting stuck there but is that it?
Thanks