I read a clinical research paper about the results of shock collars and promptly returned the one that I had just bought (never used). Yes, they may become submissive and exhibit the behavior you desire, but at the cost of increased anxiety and fear.

It's a shame that so few people believe in having their puppies/dogs professionally trained. It is as much for training the fur parent/family as the fur baby. What I learned: make a high pitched yelp; simulate other puppies. And divert his attention with a toy every time he bites/mouths.