Obviously not many people understand the issue. First a dog's mouth is like a person's hand. That grasp with it in addition to biting. So the first thing is bite control. As a teacher, if I was going to discipline a child and take them by the arm or shoulder I use an amount of strength that conveys control but not harm or pain. (Squeamish liberals will say that's still "violent" and will "traumatize" a kid... completely ridiculous. But this is one reason why modern teachers can't control kids... because mommy has a lawyer in her pocket and, more recently, inflammatory social media). Anyway, dogs have to learn that kind of bite control in the litter between 6 and 7 weeks of age biting and being bitten by their siblings. The #1 way to get a dangerous biting dog is remove them from the litter too soon.
Then there is a second issue -- the idea that a dog must know to never put it's teeth on a human. This philosophy of training is up for debate. Obviously if you have particular misgivings about your dog's bite control (ability not to break skin) or it's personality (desire to deliberately break skin), you want to go this route. The best way to do this is de-emphasis training. Play with the puppy intensely and THE PRECISE MOMENT the dog's teeth touch you, you need to break off play, disengage entirely by turning your back and/or walking away. Dogs are social. The puppy will understand that if they put teeth on you, they will be ostricized from the pack. Ignore the pup's efforts to re-engage you, and only acknowledge its presence after the passage of enough time to not confuse the puppy -- it needs to be clear about the cause and the effect. Make sure every person in the household -- and even visitors -- follow this procedure whenever the puppy's teeth contact them.