Conspiracy Theory: Why can grown ups eat ice cream with their front teeth?

So I was at Sami's the other day, and we were discussing how our teeth were too sensitive to eat cold things with our front teeth. Then I brought up how when I was little, I remember grown ups being able to do it, and everybody always said you just grow out of it. So you would think that my teeth would be mature enough to eat ice cream by the time I was 19. 

Then Sami's sister, Suzy, brought up the possibility that all grown ups really wear dentures, and that's the only reason why they can eat ice cream with their front teeth. Have we been raised in the midst of this conspiracy???? What do you think? Any dentists have an answer??