The Mentawai are so convinced that pointed teeth are more attractive than flat that the men would probably be more interested in your canines than your cleavage. And for the women of the tribe, it means that once they reach adulthood, it's time to have their teeth chipped away and filed down to points, because how else will they catch the eye of a potential husband?
"It's cool, guys dig this."
As you might expect, having someone hack at your pearly whites with a hammer and chisel wasn't exactly a pleasant experience, and the process left the teeth damaged and prone to infection. Sexy infection.
The process is less common these days, since the march of Western culture has pushed out a lot of obscure tribal traditions in favor of cigarettes and HBO, but high-ranking females like the wives of tribal chiefs still prefer to have the procedure done, because nothing says "status symbol" like the ability to cleanly bite the head off a small mammal.