Child, or xenomorph?

[Dr Mordrid]

Looks like a refugee from the Nostromo

http://io9.com/5910844/the-mouth-of-a-child-is-a-terrifying-thing-to-behold

Inside the mouth of every child is a terrifying double row of teeth. Not that you'd ever know it — muscle, skin and bone prevent most of us from ever catching a glimpse of this extra dentition. Here's your chance to get a close-up look at what lies beyond the gum line.
>

[Belwarrior]

wonder where my third pair of front teeth were sitting,
btw, my dad and myself had an extra pair of insisors, mine was removed when i was around 8 yrs old.

still the picture above is pretty scary, especially since i'm so used to seeing skulls with the normal set of teeth