Ciao. When I was studying psychology I came across the term "oral agression" in reading about Fritz Perls' Gestalt therapy. One of his books was "Ego, Hunger and Aggression" where he uses this term.

Hope this helps :)

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Note added at 26 mins (2009-01-26 18:32:31 GMT)
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I find 'dental' aggression less often in Google in this context, but for a translator-dentist this might be a more appropriate term :) and more seriously 'dental' aggression might be a better, more specific term to indicate biting and attacking food:

"Perls described its origins in what he called "dental aggression," the biting off and chewing up of one's experience in order to absorb the parts of it one needs and get rid of what one doesn't. "

See: http://www.gestalt.org/phgintro.htm

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Note added at 2 hrs (2009-01-26 20:07:31 GMT)
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For all of us interested in Italian-style Gestalt therapy, I just came across an interesting site: http://www.eagt.org/biblio/Italian_Bibliography_2002.htm

See especially the reference by Spagnuolo:

"La Formazione ln Gestalt Terapia. Come la prospettiva dell'aggressione dentale modifica il concetto tradizionale di formazione, "

I think now that 'dental' aggression is a better expression in this case, as Mirra is saying.