Interesting discussion RE Teeth. We will probably be adding teeth when and where they are needed, and balanced for effect vs performace.
For example, the GW is famous for it's large visable teeth in mulitple rows. These teeth are constantly being replaced. In some cases they are actually stick out beyond the jaw line before they break off. Our Great White has teeth and has a wonderful dental plan as Tiny points out. However, the bottom dwelling angel shark, No teeth is my vote... When we put behaviour and territory elements into the game, you will just never see them
Also, not all shark species have clearly visible teeth. For example:
http://www.vibrantsea.net/hammerhead17_cocos1.html
and
http://www.chirpingbird.com/netpets/.../fishfac1.html
I have not yet gone down the list of all of our sharks, but I would hazzard a guess that the majority of them will not benefit from, or be biologically accurate with visible teeth.