Where do you find the dentures in fossil fighters

Hi, you can find it in bottomsup bay.
You're in Nick Nack's mission? If you are, when you arrive in the deep sea there are dentures sharks. When you pass from all of them, they will disappear and in this other part of the sea you're you can find three holes. One in the middle, one in the right and one in the left. To take the dentures you go to the middle hole. When you go down you'll see a shark putting his dentures on the floor, next he'll see you and then he'll. When it happens you only take the denture and clean. That's all!