Yes we do. All herbivorous animals have flat teeth. Most humans have somewhat pointed teeth. If you've ever been anywhere near a horse or deer you'd know what I mean.
You eat fish yet you complain about red meat? You do know about the heavy dumping of industrial chemicals into the ocean right? Or the fact that some of the best commercial fishing grounds are near sewage treatment plants? Or that fish soak up shit in their gills?
There is no such thing as safe food.