Don't worry, the teeth are far back enough that there's no risk of you being bitten by an inquisitive fish! It's easy to find these teeth on the floor of your tank if you don't use a substrate. I have collected many of them over the past few years, leading my friends and family to conclude that I'm absolutely nuts! And maybe I am... :)
I keep my collection in this little tooth case. What would the dentist think!
Here's a photo of the teeth in my hand to show their small size.
So there you have it, goldfish teeth!