You need to tell the puppy "no" in a stern voice without yelling and offer a chew toy instead. Sometimes rolling the cheek in so the dog bites its cheek slows them down a bit. If your puppy gets out of control, a time out in a dog crate can be helpful. In case teething is causing discomfort, you might try H2O-IonX (in the water or on the food) to make the gums feel better. The other thing to look at is the dog food and treats. What do you give? Some ingredients can make a dog more excitable. Also, what breed is your dog?