I've seen a dog style method that used biting as an attack strategy. That's just nasty. It's not something that you really need to teach people. We all bite whenever we eat a sammich or something. It's instinctive. The only reasonable practical application is to get out of some sort of grappling lock. If you can get your face that close to someone else's, wouldn't a head butt be better?
You do need to teach how to defend against a bite.
Gene Ching
Publisher www.KungFuMagazine.com
Author of Shaolin Trips
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Biting is also the best way to fight off an anaconda.
Or a vulture. Once I was being crucified on the Tree of Woe, and it worked like a charm. Crooooooommmmm!