RE: teeth, apes, etc:
While it is certainly true that chimps eat insects, and even occasionally hunt for meat (many chimp troops hunt and colobus monkeys and other small animals for food), the overwhelming majority of their diet is "vegan" - obviously, in the wild, they consume no milk other than that provided by their mothers. Not all chimps hunt and although meat is sometimes shared, there are chimps who seldom or never eat meat.
Most great apes obtain most of their protein from terrestrial herbaceous vegetation (leafy greens).
All of this is beside the point, really. As omnivores, we (and our teeth) can derive nutrition from a variety of sources. My teeth may have the capacity to tear and chew meat, but that doesn't mean I HAVE to eat it. I have a brain and ethics, too, and I choose to employ those in making my food choices.
As a vegan, I have heard all of these arguments many, many times:
Plants feel pain, too (so I might as well start eating meat again?)
Humans evolved to eat meat, look at our teeth (so if i don't eat meat I'll make "evolution" mad? My teeth will fall out?)
Veganism is unhealthy and faddish, and by being vegan you're just trying to be cool (I have to defend my veganism every day. EVERY DAY. It isn't easy, and it's definitely not "cool". And eating a primarily plant-based diet isn't a new idea, many cultures all over the world have done so for thousands of years).
Vegans are angry judgmental extremists who sit around eating tofu and feeling superior (OK, true. Ha! Just kidding!)
I have enormous faith in my fellow humans that we can cooperate to find ways to end cruel, environmentally destructive factory farms and other abuses of animals - all I ask is that you stop worrying about my "ridiculous" dietary choices and try to find out as much as you can about the ways the majority of the animals we consume are treated, and how these practices affect the animals, the world, you, your families, etc.
Are you really comfortable with these practices? If so, fine. I'm not, so I decided to stop supporting them. If you're not, you might choose to change your consumer habits in some way. Or not. This wasn't a decision that I made lightly and easily - and I wasn't born a vegan. I got here after many years of omnivorousness.