Actually our four canine teeth are there for emergencies when humans can't find plants. I eat occasional meat, but I'm mostly vegetarian.

Here's one article about it:
http://michaelbluejay.com/veg/myths.html

So we evolved canine teeth for emergencies? Evolution takes many, many, many years to change anything. We would have to be eating meat for many, many, many years to even evolve canines. They don't just appear when there are no vegetables around.

Also in that article it says that only vegetarians have molars. That doesn't prove anything. We're omnivores so obviously we would have molars. Molars for crushing. Canines and incisors for cutting. You don't need to cut soft things like vegetables because the force of our jaws can crush ANY kind of vegetable or fruit.

Also, ever watch a dog eat lettuce? It looks a little differently... doesn't it.

http://www.ethicalvegetarian.com/challenges.html

You can try this one too if you don't like the other one.