Why do dogs like to bite me wrong behavior to teach timely Oh!

Why do dogs like to bite me Dogs like to bite people because they are playing with their owners, if the family keeps more than one dog, the dogs will play with each other when they bite each other. In the case of some families keeping a dog, the dog does not play with the object, it will be on the human mouth. General dog bite master are playful bite, will not bite the master pain. But this behavior is wrong, the owner needs to teach the dog.