Piranhas are small, carnivorous fish that are native to the rivers of South America. They are known for their sharp teeth, which they use to slice through the flesh of their prey. Piranhas typically eat fish, but they will also attack other animals, including humans.
Sharks are also carnivorous fish, but they are much larger than piranhas. Sharks have rows of sharp teeth that they use to tear through the flesh of their prey. Sharks typically eat fish, but they will also attack other animals, including humans.
So, the answer to the question is piranha. Piranhas are the teeth shapers, not sharks.