Many fish do have teeth.
Yes, but depends on the species, just like it does in salt water fish. Just because you can't see a fishes teeth doesnt mean it doesnt have any. Many fish have what are called phyringial teeth, which means they are set further back in their mouths/throat. Carp are a good example of a fish having this sort of dental arrangement. Good examples of freshwater fish with prominent teeth are piranah's, gar, pike etc!
a fish is small and it dose not have teeth. so that meens that sharks have sharp teeath fish dont have any
No, not all fish have sharp teeth. Some fish have teeth specialized for grinding or crushing their food, while others have no teeth at all and feed using other methods such as suction or filter feeding.
dolphins do use them. they use them to catch fish and to tear things apart.
that may depend if it its other fish for food
The Wolf Fish has 400 teeth which is 4 times the amount as the piranha fish.
Many fish do have teeth.
scales, fins, gills, teeth, eyes, intestines, mouth, skin
Fish have around 30,40,or 50 teeth depending on size.
hatchet fish have 55 teeth so they can eat there pray.
The kind of fish that has razor-sharp teeth is the barracuda.
Sharp teeth.