Teeth and gums
Going by our teeth, humans are omnivores. Our sharp front teeth (incisors) could still cut through freshly killed prey, while our powerful back teeth (molars) could grind through tough roots. The bad news is that our teeth are not very durable. Although the outer enamel is very hard, it is susceptible to attack by some kinds of oral bacteria. Our gums are also quite sensitive. As a result of all of this, only 1 out of 100 adults actually have completely healthy teeth and gums.