The pig’s mouth revealed its ordinary sharp, tusk-like canines saddled up beside smaller, slightly more human-looking teeth nubs. In theory, a similar process could play out in humans.

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Incisors are the sharp teeth at the front of the mouth that bite into food and cut it into smaller pieces. They are flat with a thin edge. They are also called anterior teeth.

In this image, you can see the rows and rows of hooked teeth (1) that line a snail’s tongue. Notice that the right and left sides of the tongue are mirror images of each other. Depending on their age, ...