Subject: What was the adaptative advantage for H. sapiens to lose the large canines?

Considering that all the closest species to H. sapiens (Australoptecines, 
Chimpanzees and Gorilas), have large canine teeth, and that most of them 
are considered to have diets that are basically plants and fruits, what 
was the adaptative advantage that might have made the the genus Homo lose 
it´s large biting teeth (canines)? It is even stranger when we consider 
that Homo increasingly added meat to it´s diet, in comparison to the 
relative apes.

Re: What was the adaptative advantage for H. sapiens to lose the large canines?