Ingenious advertising campaign by Colgate

I noticed the extra arm

I missed every one of them . I couldn't stop looking at the teeth!

Awwwwwww.. I failed

I was looking at the arrows. Never saw the extras or the food in the teeth

Faiiiled

I kinda cheated I've seen this before.. ~_~

who the fucks arm is that??

Beauty of psychology.. you're primed to look for the dirt in the teeth, completely missing the obvious in the photo. Inattentional blindness.

the fuck

When you look at the last one you know there's something wrong but you don't know it

Shit, I think I need some floss now.

I missed all the teeth too

I got two all of them except for the finger