<P> This was the first common style of shark tooth , present in the plentiful cladodont teeth of the devonian , four hundred million years ago . Sharks with needle - like teeth commonly feed on small to medium - sized fish , sometimes including small sharks . These teeth are especially effective for such prey because they can easily grip their slippery and narrow bodies . Modern examples include the blue shark and bull sharks . These sharks specifically use their teeth to feed on small prey like squid , flounder , stingrays , and even hammerhead sharks . </P>
what does a bull shark tooth look like
needle - like